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【判断题】
薄层色谱可用于化合物纯度的鉴定,有机反应的监控,不能用于化合物的分离。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Why does the author say 'we are deprived of the use of our eyes'?
A.
People won't use their eyes.
B.
In traveling at high speed, eyes become useless.
C.
People can't see anything on his way of travel.
D.
People want to sleep during travelling.
【单选题】人们常说：“开卷有益”。就一般情况而言这是对的。其实，开卷未必均有益，问题是开什么卷?好书如“圣水”；坏书如“魔鬼”，可以使人产生邪念，诱使读者沿坡下滑，甚至会坠人阴暗之深渊。因此，在茫茫书海中，我们要学会提纯拔萃、弃莠存良的本领，做到“博学之，审问之，慎思之，明辨之，笃行之”。这段话的观点是( )。
A.
读书要勤于思考
B.
只要开卷就有益
C.
读书要善于选择好书
D.
好书如“圣水”
【简答题】避免汽阻断流可以采用_______________卸油。
【单选题】Why does the author say we are deprived of the use of our eyes?
A.
People won't use their eyes.
B.
In traveling at high speed, eyes become useless.
C.
People can't see anything on his way of travel.
D.
People want to sleep during traveling.
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