填空题

( )确保电源插座与插头相符。

【参考答案】

E
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( )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。
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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.
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