1. The purpose of this dialog is to _______.

1. The purpose of this dialog is to _______.选择一项:A. receive visitorsB. introduce

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角频率ω与频率f的关系式是ω=()

角频率ω与频率f的关系式是ω=()

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George asks Melinda to hand in the plan next week.

George asks Melinda to hand in the plan next week.选择一项:对错

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电阻是( )元件

电阻是( )元件 A.储存电场能量B.储存磁场能量C.耗能D.以上都不对

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