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【判断题】
气相色谱法和液相色谱法是根据流动相的不同分类的A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】小纸片会在发声的扬声器上跳动 , 树叶随风荡漾发出 “ 哗哗 ” 的响声,这些现象说明了 ( )
A.
声音是由物体振动产生的
B.
声音能在水中传播
C.
声音的传播需要介质
D.
声音能传递信息
【单选题】The girl usually does her homework _____ it is very late at night.
A.
until
B.
when
C.
before
【单选题】The girl usually does her homework _____ it is very late at night .
A.
until
B.
when
C.
before
D.
after
【单选题】The girl usually has supper by herself ____her parents don't have to work overtime.
A.
until
B.
unless
C.
while
D.
the moment
【单选题】The girl usually has supper buy herself___her parents don't have to work overtime.
A.
until
B.
unless
C.
while
D.
the moment
【简答题】已知3,X,21三个数成等差数列,则X等于( )。
【简答题】听下面一段对话，回答第1小题。 1. How long does the girl usually spend on her homework? A. For half an hour B. For about two hours. C. For about three hours.
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