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单选题
往复泵阀箱被吸入阀和排出阀分隔为三层，泵缸通（）。
A
上层
B
中层
C
下层
D
A或B或C
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单选题Which of the following condition is likely to develop if the thermocouple element of a pyrometer becomes coated with excessive amounts of combustion by-products?（）A
Indicated exhaust pressure readings will increaseB
Pyrometer responses will be retardedC
Indicated cylinder temperature readings will increaseD
Indicated firing pressure readings will increase
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单选题在为多台电动机设计顺序起动控制线路时，常由先起动的电机接触器的常开触点控制一时间继电器，起动其延时；而时间继电器的常开延时闭触点串入下一个待起动电机的接触器线圈回路中。此控制环节称之为（）。A
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互锁控制C
连锁控制D
自保控制
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exhaust and suction processB
suction and compression processC
combustion and exhaust processD
working and exhaust process
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Exhaust temperaturesB
Raw water pressureC
Lube oil pressureD
Air box pressure
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Ⅰ+Ⅱ+ⅣC
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I~IIIB
I~IVC
I、II、IVD
II~IV
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机动船从事拖带，拖带长度大于200米C
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单选题Each cylinder liner on the marine medium speed engines （）.A
is usually cooled by sea waterB
can be replaced when worn outC
is in direct contact with the water in the bore of the cylinderD
can t expand when heated
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单选题Lubricating oil used in a diesel engine serves to（）A
reduce the wear of bearing surfacesB
cool the bearing surfacesC
assist in sealing bearing surfacesD
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受载期是指船舶预期到达装货港或地点，并做好装货准备的日期B
解约日是指船舶抵达合同约定或承租人选定的装货港并做好装货准备的最后期限C
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