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【单选题】
三相交流电是由三个（）的三个按正弦规律变化的电动势（或电压、电流）构成的电源。
A.
振幅和初始角相同而初始角频率不同
B.
频率和初始角相同而振幅不同
C.
振幅和频率相同而初始角不同
D.
振幅、频率和初始角都相同
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none have been
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B.
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C.
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A.
There are serious defects in the mechanism of American social security.
B.
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C.
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a++;
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b++;
C.
c++;
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d++;
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