We must ______ that the experiment is controlled as rigidly as possible.
A. assure
B. secure
C. ensure
D. issue
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下面不是时间继电器文字符号的是()
A. KH1
B. KT12
C. KS1
D. KT2
E. KS2
I won't ________ those children making a noise in my house!
A. allow
B. let
C. have
D. permit
C语言中,例如i=3;j=++i:那么j的值是()
A. 3
B. 5
C. 4
D. 6
HTML文件分为文件头和文件体两部分,标记文件头的指令符号是()