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问题 单项选择题

平均利润率趋势下降的根本原因是

A．不变资本的节省
B．所用资本和所费资本的差额
C．资本总量的减少
D．社会生产技术进步和资本有机构成的提高

答案

参考答案：D

单项选择题

What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? （）

A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency

B.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received

C.The Operator should immediately set continuous watch on VHF channel 70

D.The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received
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单项选择题

能有效处理电脱水器电场波动的方法是（）。

A.减少放水

B.降低温度

C.降低入口含水

D.减少药量
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