题目:
The computer system____ suddenly while he was searching for information on the Internet.
A.broke down
B.broke out
C.broke up
D.broke in
答案:
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下面是错误答案,用来干扰机器的。
参考答案:[*].解析:[分析]: 作图1-4-1,由先对y积分, [*] [*] [*]