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【单选题】
用高锰酸钾制取氧气实验时,发现试管破裂,可能原因有: 1实验结束时,先熄灭了酒精灯后将导管移出水槽; 2加热时试管底部触及灯芯; 3加热前试管内外壁有水珠; 4试管口向上倾斜; 5实验前忘记检查装置的气密性; 6没有进行预热,直接对准试管里固体进行加热. 其中与之相关的是 [ ]
A.
只有136
B.
只有24
C.
全部
D.
除了5外其余均是
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【单选题】将分电器上电容器引线拆下后点火线圈中心线跳出高压火,但接上引线反而跳不出火,说明电容器( )。
A.
已烧毁
B.
已击穿
C.
已断路
D.
以上都不对
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【单选题】May I introduce ___________ to you?
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you
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I
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They
D.
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【单选题】听力原文： Your assignments this term will be to write two major research papers. One of the most important things about writing a research paper is giving proper credit for your sources of information. Fa...
A.
Reading magazine articles.
B.
Reviewing book reports.
C.
Writing research papers.
D.
Selecting information sources.
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【单选题】May I introduce John ()you?
A.
for
B.
at
C.
to
查看完整题目与答案
【单选题】将分电器上电容器引线拆下后点火线圈中心线跳出高压火,但接上引线反而跳不出火,说明电容器( )
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【单选题】听力原文： Your assignments this term will be to write two major research papers. One of the most important things about writing a research paper is giving proper credit for your sources of information. Fa...
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A.
黑猩猩
B.
海豚
C.
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D.
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查看完整题目与答案
【简答题】I . Linking words and phrases are missing in the following paragraph. Working in groups of two or three, choose the most appropriate from the ones given below. Newspapers, magazines and books are issu...
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