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单选题
Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）
A
corrosion on the gears
B
excessive gear speed
C
dirt in the oil
D
misalignment of the gears
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单选题The revision date of a chart is printed on which area of the chart? （）A
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单选题Tensile stress is a result of two forces acting in（）.A
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考题
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the beautiful sunset in lines 112
考题
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单选题A bilge suction line，in a fishing vessel with more than 16 individuals aboard，must have a strainer with an open area not less than how many times the open area of the suction line?（）A
oneB
twoC
threeD
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单选题Which mooring line prevents sideways motion of a vessel moored to a pier（）.A
A line led forward from the bowB
A line led aft from the bowC
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A line led at a right angle to the keel
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