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【单选题】
目前常用的镇静催眠药是A.
苯巴比妥
B.
硫喷妥钠
C.
司可巴比妥
D.
水合氯醛
E.
唑仑
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皮皮学刷刷变学霸
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【多选题】下列叙述中( )是对气相色谱固定液的要求。
A.
热稳定性好,在使用温度下不会发生热解或化学反应
B.
蒸气压低,不会造成固定液易流失现象的发生
C.
对样品具有一定的选择性,这有助于样品的分离
D.
粘度要高,它有助于样品中的被测组分附着在柱上,便于分离
【单选题】Which of the following, if presented as the first sentence of a succeeding paragraph, would most logically continue the discussion presented in the passage?
A.
Timekeeping in medical tomography must be precise because the changes in travel time caused by density fluctuations are slight.
B.
To understand how ocean acoustic tomography works, it is necessary to know how sound travels in the ocean.
C.
Ships are another possibility, but they would need to stop every 50 kilometers to lower measuring instruments.
D.
These variations amount to only about 2 to 3 percent of the average speed of sound in water, which is about i 500 meters per second.
【简答题】在Windows中，能快速实现中英文输入法切换的组合键是（）。
【简答题】What is the first step in the process of teaching children to swim?
【简答题】在Windows系统,进行中英文输入法直接切换的方法是按 组合键来实现。
【简答题】Signing the FCTC is only the first step toward__________
【多选题】下列叙述中()是对气相色谱固定液的要求。
A.
稳定性好,在使用温度下不会发生热解或化学反应
B.
蒸汽压低,不会造成固定液易流失现象的发生
C.
对样品具有一定的选择性,这有助于样品的分离
D.
粘度要高,它有助于样品中的被测组分附着在柱上,便于分离
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