单项选择题

Specialized dictionaries for business or other areas such as financing or accounting can be found on the Internet.

A．对
B．错

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单项选择题

下列有关电与能源的相关说法正确的是？

A.原子核由质子和电子组成
B.煤、石油、天然气属于可再生能源
C.波长越长的电磁波，频率越低

单项选择题

The value of the power received by device C is 24 mW.
A、正确
B、错误