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He put _______ $20,000 as a deposit on the beautiful $200,000 villa believing that his investment would increase over time.

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有人试图把电流表接到电源两端测量电源的电流,这种想法对吗?若电流表内阻是0.5Ω,量程是1A,将电流表接到10V的电源上,电流表上将会流过多大的电流?会发生什么后果?

H5的____属性用来控制视频的播放

By now a crowd had gathered, and their voice began to rise in shared complaint.

如何判别二极管的极性与性能?

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