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单选题
船舶采用大角度驶靠码头,当流弱且有强吹开风时,驶靠角度可()。
A
大些
B
小些
C
不变
D
有时大些,有时小些
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单选题某船正浮且排水量Δ=6905t,航行途中在右舷距船中8m处的油舱消耗油水33t后,测得船舶横倾2.4°,则此时船舶GM约为()m。A
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单选题只改变空气运动的方向、不改变空气运动的速度的力是()。 Ⅰ.气压梯度力;Ⅱ.地转偏向力;Ⅲ.惯性离心力;Ⅳ.摩擦力;Ⅴ.重力;Ⅵ.粘性力。A
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Ⅰ,Ⅱ,Ⅳ,ⅤC
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考题
单选题The cetane number rates fuels for diesel engines according to its ()A
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①+③+⑤B
②+③+⑤C
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考题
单选题关于主轴承材料说法不正确的是:()。A
锡基白合金和锡铝合金都可作主轴承轴瓦材料B
锡基白合金的嵌入性比锡铝合金好C
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单选题Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?()A
The pump delivers full capacity when started, but gradually slackens off toan abnormally low flowB
The pump packing gland overheats after short operating periodsC
The motor over-current protective device continually shuts the pump downD
Pounding noises can be heard at the pump suction chest
考题
单选题If the main engine starting consecutively failed () times, it should be found the cause before another starting.A
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3C
4D
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考题
单选题操纵船舶时,可借助提高螺旋桨的滑失比以增加舵效,对于可变螺距螺旋桨,这需要:()A
降低螺旋桨的进速,增大螺旋桨的螺距B
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考题
单选题The supercharger takes air out of the surrounding atmosphere and then feeds it to the engine’s ().A
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