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【单选题】
以下哪个选项属于物的不安全现象( )。A.
使用的电气设备类别不符合要求
B.
未按规定对安全用具定期进行绝缘检测和试验
C.
临时线路绝缘不好，线径与负荷不匹配
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】简述Watson-Crick DNA双螺旋结构的要点。 {
【简答题】简述Watson-Crick双螺旋结构的要点。
【单选题】_________the answer, the boy, who asked the question, still stood with his hand ______.
A.
Giving, raised
B.
Giving; rising
C.
Given; risen
D.
Given; raised
【单选题】_________ there are certainly times when giving up trying is the right thing to do, in most cases all needed is commitment and communication.
A.
Unless
B.
Before
C.
Although
D.
Since
【简答题】简述Watson和Crick等人提出的B-DNA双螺旋结构模型的要点和结构参数。
【简答题】简述Watson-Crick DNA双螺旋结构模型的要点。
【单选题】That rude boy ________ have rushed out of the classroom when Ms Green was giving a lecture, which finally led to his being punished by the head teacher. [ ]
A.
could
B.
must
C.
dare
D.
should
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