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【单选题】
知交变电流的瞬时值的表是i＝5sin50πt (A), 从t=0到第一次出现最大值的时间是：A.
6.25秒
B.
1/200秒
C.
．1/150秒
D.
1/100秒
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Bob thought he couldn’t go to the party because he had too much homework, but persuaded by his friends, he went _________.
A.
above all
B.
in all
C.
after all
D.
first of all
【简答题】Bob comes out of the station and at once he doesn't know where to go. He comes to see his good friend, Peter. Peter is a worker. He works in a factory, but Bob doesn't know where the factory is. He wa...
【简答题】打开对齐面板的快捷键为________。
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