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【单选题】
采用液 - 液萃取法分离化合物的原则是A.
两相溶剂互溶
B.
两相溶剂互不溶
C.
两相溶剂极性相同
D.
两相溶剂极性不同
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反馈参考答案：
举一反三
【单选题】油井混合物在保持接触的条件下,随着压力的逐渐降低,气体不断逸出,在压力每降到某一数值时气体排出一次;如此反复直至系统的压力降为常压,平衡气排除干净,称为 。
A.
一次分离
B.
连续分离
C.
多级分离
D.
持续分离
【单选题】Although we tried to concentrate on the lecture, we were ______ by the noise from the next room.
A.
distracted
B.
displaced
C.
discharged
D.
discarded
【单选题】We tried to ______ our conversation to arguments relevant to the topic.
A.
confirm
B.
confine
C.
confuse
D.
conduct
【单选题】Although we tried to concentrate on the lecture，we were （ ） by the noise form. the next room．
A.
distracted
B.
displaced
C.
dispersed
D.
discarded
【单选题】We tried to ring you back，Bryan, but we think we ______ your number incorrectly.
A.
looked up
B.
got through
C.
took down
D.
worked out
【简答题】We tried to d______ him from climbing the mountain without a guide.
【单选题】油井混合物在保持接触的条件下逐渐降低压力;随着压力的降低,气体不断从液体中逸出,最后在常压容器中一次性将气液两相系统分离开来,称为 。
A.
一次分离
B.
连续分离
C.
多级分离
D.
持续分离
【单选题】We tried to restrict our conversation to arguments relevant to the topic.
A.
put
B.
suit
C.
confine
D.
resort
【简答题】风景简笔画的创作步骤有哪些?
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