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[单选题]

Shake a quantity of the powdered tablets containing 0.20 g of Aspirin with 4 mL of et

A.精密称取片粉适量(相当于阿司匹林0.20 g)，与4mL乙醇(96%)一起振摇，加水稀释至100 mL，操作温度不超过10°

B.取片粉适量(相当于阿司匹林0.20 g)，加4 mL乙醇(96%)振摇，加水稀释至100 mL，操作温度不超过10°

C.取片粉适量(相当于阿司匹林0.20 g)，加4 mL乙醇(96%)振摇，加水稀释至100 mL，操作温度在10°C以下。

D.精密称取片粉适量(相当于阿司匹林0.20 g)，与4mL乙醇(96%)一起振摇，加水稀释至100 mL，操作温度10°C以上。

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更多“Shake a quantity of the powdered tablets containing 0.20 g of Aspirin with 4 mL of et”相关的问题

第1题

Shake a quantity of the powdered tablets containing 0.20 g of Aspirin with 4 mL of ethanol （96%) and dilute to 100 mL with water at a temperature not exceeding 10°. （Which translation is right？)

A.精密称取片粉适量（相当于阿司匹林0.20 g），与4mL乙醇（96%）一起振摇，加水稀释至100 mL，操作温度不超过10°C。

B.取片粉适量（相当于阿司匹林0.20 g），加4 mL乙醇（96%）振摇，加水稀释至100 mL，操作温度不超过10°C。

C.取片粉适量（相当于阿司匹林0.20 g），加4 mL乙醇（96%）振摇，加水稀释至100 mL，操作温度在10°C以下。

D.精密称取片粉适量（相当于阿司匹林0.20 g），与4mL乙醇（96%）一起振摇，加水稀释至100 mL，操作温度10°C以上。

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第2题

Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not they find themselves suffering from headaches and watering eyes, and even snowblindness, when exposed to several hours of "snow light".

  The United States Army has now determined that the glare from snow does not cause snowblindness in troops in a snow-covered country. Rather, a man's eyes frequently find nothing to focus on in a broad expanse of a snow-covered area. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscle aches. Nature balances this annoyance by producing more and more liquid which covers the eyeballs. The liquid covers the eyeballs in increasing quantity until vision blurs. And the result is total, even though temporary, snowblindness.

  Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even the scouts themselves throw lightweight, dark-colored objects ahead on which they too can focus. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching through the snow-blanketed landscape. By focusing their attention on one object at a time, the man can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a solid white area is overcome.

The eyeballs become sore and the eye muscles ache because______.

A.tears cover the eyeballs

B.the eyes are annoyed by blinding sunlight

C.the eyes are annoyed by blinding snow

D.there is nothing to focus on

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第3题

Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not th
ey find themselves suffering from headaches and watering eyes, and even snowblindness, when exposed to several hours of "snow light".

The United States Army has now determined that the glare from snow does not cause snowblindness in troops in a snow-covered country. Rather, a man's eyes frequently find nothing to focus on in a broad expanse of a snow-covered area. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscle aches. Nature balances this annoyance by producing more and more liquid which covers the eyeballs. The liquid covers the eyeballs in increasing quantity until vision blurs. And the result is total, even though temporary, snowblindness.

Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even the scouts themselves throw lightweight, dark-colored objects ahead on which they too can focus. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching through the snow-blanketed landscape. By focusing their attention on one object at a time, the man can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a solid white area is overcome.

The eyeballs become sore and the eye muscles ache because______.

A．tears cover the eyeballs

B．the eyes are annoyed by blinding sunlight

C．the eyes are annoyed by blinding snow

D．there is nothing to focus on

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第4题

Many people believe the glare from snow causes snow blindness.Yet, with dark glasses or no
t, they find themselves suffering from headaches and watering eyes, and even snowblindness, when exposed to several hours of "snow light". The United States Army has now determined that the glare from snow does not cause snow-blindness in troops in a snow-covered country.Rather, a mans eyes frequently find nothing to focus on in a broad expanse of a snow-covered area.So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at.Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscle aches.Nature balances this annoyance by producing more and more liquid which covers the eyeballs.The liquid covers the eyeballs in increasing quantity until vision blurs.And the result is total,even though temporary,snowblindness. Experiments led the Army to a simple method of overcoming this problem.Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape.Even the scouts themselves throw lightweight, dark-colored objects ahead on which they too can focus. The men following can then see something.Their gaze is arrested.Their eyes focus on a bush and having found something to see, stop searching through the snow- blanketed landscape.By focusing their attention on one object at a time, the man can cross the snow withoutbecoming hopelessly snowblind or lost.In this way the problem of crossing a solid white area is overcome.

The eyeballs become sore and the eye muscles ache because______.

A．tears cover the eyeballs

B．the eyes are annoyed by blinding sunlight

C．the eyes are annoyed by blinding snow

D．there is nothing to focus on

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第5题

Many people believe the glare from snow causes snow-blindness．Yet，dark glasses or not，they find themselves suffering from headaches and watering eyes，and even snow-blindness，when exposed to several hours of“snow light”． The United States Army has now determined that glare from snow does not cause snowblindness in troops in a snow—covered country．Rather，a man’s eyes frequently find nothing tofocus on in a broad expanse of barren snow—covered terrain．So his gaze continually shifts andjumps back and forth over the entire landscape in search of something to look at．Finding nothing，hour after hour，the eyes never stop searching and the eyeballs become sore and the eye muscles ache．Nature offsets this irritation by producing more and fluid which covers the eyeball．The fluid covers the eyeball in increasing quantity until vision blurs，then is observed，and the result is total，even though temporary，snow—blindness． Experiments led the Army to a simple method of overcoming this problem．Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes，creating a dotted line asthey cross completely snow—covered landscape．Even the scouts themselves throw lightweight，dark colored objects ahead on which they too can focus．The men following can then see something．Their gaze is arrested．Their eyes focus on a bush and having found something to see，stop scouring the snow—blanketed landscape．By focusing their attention on one object at a time，the men can cross the snow without becoming hopelessly snow—blind or lost．In this way the problem of crossing a solid white terrain is overcome．To prevent headaches，watering eyes and blindness caused by the glare from snow，dark glasses are__________．

A.indispensible

B.useful

C.ineffective

D.available

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