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单选题
对溺水患者，如果呼吸停止，应立即进行口对口人工呼吸，人工呼吸的频率是（）。
A
10次左右/分钟
B
16次左右/分钟
C
20次左右/分钟
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单选题It was （）midnight that we removed the trouble and went back to our cabin.A
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单选题A crew member has suffered frostbite to the toes of both feet. You should（）.A
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warm the feet with a heat lampC
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lube oil viscosity breakdownC
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uneven heat expansion of the piston
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单选题A fuse that blows often should be replaced only with a fuse of （）.A
the recommended current and voltage ratingB
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higher current and lower voltage ratingD
lower current and higher voltage rating
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ballast tanksB
sludge tanksC
machinery space bilgesD
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单选题A vessel is equipped with twin propellers，both turning outboard with the engines half ahead. If there is no wind or current and the rudders are amidships，what will happen?（）.A
The bow will swing to starboardB
The bow will swing to portC
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