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【单选题】
已知交流电压为U=100sin(314t-π/4)V则该交流电压的最大值Um=( )A.
314t
B.
100
C.
sin
D.
141
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举一反三
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A.
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B.
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C.
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D.
to be read
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A.
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B.
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A.
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B.
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C.
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A.
G
B.
R
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