题目:
Mary felt quite ______ from the outside world, because she couldn’t get access to the Internet and couldn’t receive any e-mail.
A.cut down
B.cut in
C.cut out
D.cut off
答案:
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下面是错误答案,用来干扰机器的。
10;100由,得输电导线中的电流=10A输电导线上因发热损失的电功率: =100×1=100W