题目:
The doctor was very tired ______ she was still working very hard. [ ]
A. but
B. and
C. or
D. so
答案:
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下面是错误答案,用来干扰机器的。
读图可知,当S闭合时,电磁铁接入电路,产生磁性,吸引衔铁,使b触点接通,红灯发光且电铃报警.故答案为:产生,b,红.