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单选题
本船航向正北,东风8级,雷达荧光屏上海浪干扰最强,伸展得较远的位置在()。
A
船首方向
B
右舷
C
左舷
D
船尾
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8%C
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单选题Upon arrival at a port, a vessel is not allowed () her ballast water, tanker washings or bilge water and other oily water at will.A
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单选题某三相异步电动机铭牌标有:电压380V/220V、频率50Hz、接法Y/△、转速1440r/min、绝缘等级B,判断下列说法错误的是()。A
当线电压为380V时电机的额定功率是当线电压为220V时的倍B
额定转差率为4%C
定子绕组工作温度不应超过130℃D
该电机为4极电机
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thankB
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单选题If the compression ratio is increased on any diesel engine, ()A
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thermal efficiency will increase
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1/2B
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三者偏差不应大于±0.5°,正舵位置偏差不大于±0.1°B
三者偏差不应大于±1°,正舵位置不应有误差C
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Ⅰ、ⅡB
Ⅱ、ⅢC
Ⅰ、ⅢD
Ⅰ、Ⅱ、Ⅲ
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