【单选题】【消耗次数：1】
容量瓶摇匀的次数为
①
3次
②
5~6次
③
8~10次
④
10~20次
参考答案：
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相关题目
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有关容量瓶的使用正确的是( )
①
通常可以用容量瓶代替试剂瓶使用
②
先将固体药品转入容量瓶后加水溶解配制标准溶液
③
用后洗净用烘箱烘干
④
定容时，无色溶液弯月面下缘和标线相切即可
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设 R={0,10,20,31,21,32,3}，则关系R的二次合成R○R等于：
①
{0,20,31,3
②
{1,02,03,02,13,13,2
③
{0,10,20,31,21,3
④
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I think you’ve got to the point ___ a change is needed, otherwise you’ll fail.
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when
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that
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where
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which
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They _ on the programme for almost one week before I joined them, and now we on it as no good results have come out so far.
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had been working; are still working
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had worked; were still working
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have worked; were still working
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Many people who had seen the film were afraid to go to the forest when they remembered the scenes ___ people were eaten by the tiger.
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that
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by which
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which
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A candidate for the democratic presidential nomination ______ at this moment.
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is interviewing
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being interviewed D. Interviewing
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is being interviewed
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___ is often the case, we have worked out the production plan.
①
Which
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When
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What
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As
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There are many people ___ only on-line activity is sending and receiving e-mails.
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who
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that
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which
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whose
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On his 10th birthday，Marty manages to escape from the zoo and gets onto the subway, ___ he believes that he can go to the wild.
①
which
②
from what
③
through which
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that
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He ___________ his friends for their help at the hotel now.
①
entertained
②
was entertaining
③
is entertained
④
is entertaining
【单选题】
___ is reported in the newspaper, talks between the two countries are making progress.
①
It
②
As
③
That
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What
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They are living with their parents for the moment because their own house __________.
①
is being rebuilt
②
has been rebuilt
③
is rebuilt
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has rebuilt