[单选题]废气锅炉允许的废气压力损失，对废气流速有重大影响，因为（）。

正确答案 ：D

A，B，C均对

[单选题]船舶轴系中不包括（）。

正确答案 ：C

内置式推力轴和推力轴承

[单选题]填料函式艉轴密封装置要求换新填料安装时应（）。Ⅰ.材质不变；Ⅱ.每圈长度恰好对接；Ⅲ.各道填料接口错开；Ⅳ.填料的圈数不变；Ⅴ.必须全部更换。

正确答案 ：A

Ⅱ＋Ⅲ

[单选题]（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.

正确答案 ：D

In addition to

[单选题]A separate piston cooling system is used to limit any contamination （） piston cooling glands（） the piston cooling system only.

正确答案 ：C

from；to

[单选题]Administrations should bear in mind the significance of （） in maintaining safety of life and property at sea and in preventing marine pollution.

正确答案 ：D

communication and language skill

[单选题]If （） are taken at regular intervals, any unequal distribution of load will be easily found out.

正确答案 ：A

differential of crank-webs

[单选题]The piston moving up and down keeps the crankshaft （）.

正确答案 ：C

revolving

[单选题]The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.

正确答案 ：C

positive displacement

[单选题]The main function of tie rods in the construction of large, low speed diesel engines is to（）.

正确答案 ：B

accept most of the tensile loading that results from the firing forces developed during operation

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