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【多选题】
关于精馏原理的叙述正确的是( )A.
精馏过程是简单蒸馏的重复过程。
B.
要维持精馏操作的高纯度分离,塔顶必须得设。
C.
要维持精馏操作的高纯度分离,塔底必须得设再沸器。
D.
有液相回流回流,是精馏过程的主要特点。
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反馈参考答案：
举一反三
【单选题】沙丁胺醇剂量过大引起手指震颤的原因是
A.
激动骨骼肌N 2 受体
B.
激动骨骼肌β 2 受体
C.
激动中枢胆碱受体
D.
阻断骨骼肌β 2 受体
E.
阻断中枢多巴胺受体
【单选题】When you are sleeping, you had better _____ all your windows closed. [ ]
A.
don't keep
B.
not keep
C.
not to keep
D.
don't to keep
【单选题】According to the author, if you want to keep healthy, you had better ______.
A.
make the room dry
B.
keep the food in the refrigerator
C.
wash your hands as much as possible
D.
clean the surfaces with anti-bacterial products
【单选题】You had better keep the medicine () is inaccessible to children.
A.
that
B.
where
C.
where it
D.
in which
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