_______ , our experiment would not have been finished.
A. Should he not help us
B. Did he not help us
C. Had he not help us
D. If he has not helped us
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It’s from my parents _______ I learned a lot about life.
A. who
B. that
C. whom
D. which
It's my parents ______ teach me a lot about life.
A. who
B. whom
C. that
D. which
Little _____ that we were watching his every move, so he seemed to be going his own way in this business.
A. he realized
B. he didn’t realize
C. didn’t he realize
D. did he realize
非线性电阻分类正确的是( )。① 流控型电阻② 压控型电阻③ 单调型电阻
A. ①②③
B. ①②
C. ①③
D. ②③
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