[单选题]工业中控制电压一般是直流还是交流 ( )

A、交流
B、直流
C、混合式
D、交变电压

参考答案： B

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● 工业中控制电压一般是直流还是交流 ( )
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● If he i a common carrier，he i abolutely reponible to the owner of the good carried （）any lo or damage to them unle caued by an Act of God or the Queen’ enemie，or the inherent vice in the good themelve，or the negligence of the owner of the good，or a general average acrifice.
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● Owner are to be reponible for lo of or damage to the good or delay in delivery of the good only in cae the lo，damage or delay ha been caued by the improper or negligent towage of the good．Thi mean that（）.
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● 工业中控制电压一般是直流还是交流 ( )&nbp;