题目内容

A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke

A. ①
B. ②
C. ① and ②
D. Neither ① nor ② is correct

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投资的增加会使总需求，总需求曲线移动，同时经济处于经济周期的阶段。

A. 下降；向右；经济增长
B. 上升；向右；经济增长
C. 下降；向左；经济衰退
D. 上升；向右；经济衰退
E. 上升；向左；经济衰退

关于活塞销的材料、结构与表面处理，正确的有________。I．铸铁II．合金钢III．中空结构IV．实心结构V．表面退火VI．表面淬火

A. III+IV+VI
B. I+II+III
C. IV+V+VI
D. II+III+VI

When under maneuvering conditions with the machinery being manually operated the control unit or console should be

A. automatically controlled
B. continuously manned
C. off power
D. continuously unmanned

在船舶以主机“正常全速”运行时，尽管速度设定及压力正常，转速逐渐下降，驾驶台控制立即转换至机旁控制。利用机旁操纵杆，速度被设定在正常全速，但是转速依然下降。经仔细检查确定为调速器自身故障。