[单选题]互见中，一艘从事疏浚作业操限船与另一艘清除水雷作业的操限船相遇致有构成碰撞危险，则________。

正确答案 ：C

两船均应运用良好的船艺采取行动以避免碰撞

[单选题]If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.

正确答案 ：A

the crankcase explosion

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