填空题

( )当接通电源并输入信号后,如果听到报警声,应切断电源,排除故障。

【参考答案】

G
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A.The woman is busy working.B.The woman can’t take the messages.C.Mr. Jackson is in his office.D.Mr. Jackson will be back soon.
A.The woman is busy working.
B.The woman can’t take the messages.
C.Mr. Jackson is in his office.
D.Mr. Jackson will be back soon.
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