正确答案: D

气缸余隙测量

题目：船上吊缸检修一般不必进行（）。

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学习资料的答案和解析：

[单选题]废气锅炉受热面废气温度不能太低，否则凝结的硫酸可使烟灰有粘性，会增加烟垢形成的趋势，因此锅炉废气出口温度应不低于（）℃，锅炉进口给水循环温度应高于（）℃（对有预热器的）。

155/120—130

[单选题]曲轴臂距差的符号表明曲轴（）。

受力方向

[单选题]用液压工具拆主机主轴承液压撑杆螺栓和缸头螺栓时，要注意（）。

前者是将螺栓压缩，而后者是将螺栓拉长

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

In addition to

[单选题]In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.

fresh water

[单选题]Diesel engine jacket water is used in the distillation process as the （）.

means of heating the feedwater

[单选题]The required amount in the change of speed necessary before a governor will make a corrective movement is known as （）.

sensitivity

[单选题]A Kort nozzle is a(n)（）.

hollow tube surrounding the propeller used to improve thrust