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【单选题】
中性点不接地系统,在发生单相短路接地时,只动作于( )。A.
断路器跳闸
B.
线信号后跳闸
C.
信号
D.
负荷开关跳闸
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于电源,下列说法正确的是 ( )
A.
当电池用旧之后，电源电动势减小，内阻增大
B.
当电池用旧之后，电源电动势和内阻都不变
C.
当电池用旧之后，电源电动势基本不变，内阻增大
D.
以上都不对
【简答题】根据所给选项,填入所选职位 注意:答案填入小写字母 a. salesperson b. cashier c. office clerk d. nurse e. waiter/waitress f. customer service representative g. truck driver h. general manager 6They take...
【简答题】They take orders and serve food to tables in a restaurant. _____________
【单选题】A good teacher works in quite a different way. His audience take an active part in his play: they ask and answer questions, they obey orders, and if they don’t understand something, they say so. The w...
A.
students
B.
people who watch a play
C.
people who act on the stage
D.
people who listen to something
【简答题】无聊时,通过吃零食、看电视或者参与社交媒体来打发时间,相比顺其自然,无所事是,要更糟糕。
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