UNIX shell（）。

A:是UNIX系统的内核 B:是一个应用程序 C:是一个操作系统 D:是在用户和内核之间的一个接口

A main bearing consists of two shells which are secured by means of studs and _____.

A:tie rods B:through bolts C:lead wires D:bearing caps

Bearing knocks are likely to occur from _____.

A:less clearance B:dirty lube oil C:overload D:bearing wear

The main bearing metal is a lining _____.

A:inside the bearing B:outside the bearing C:covering the crankshaft D:none of the above

The pumps press oil into the cross-head bearing gap when the load on the shell is at its lowestWhat is the meaning of “its ” in the sentence above?

A:the cross-head B:the pumps C:the shell D:the load

To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the .

A:lube oil temperature at the cooler outlet B:lube oil strainer magnets bearing C:lube oil temperature D:lube oil pressure to the bearing

The second stage feed-water temperature and shell absolute pressure in a multistage, flash type, distilling plant is ___.

A:higher than the first stage feed-water temperature and absolute shell pressure B:lower than the first stage feed-water temperature and absolute shell pressure C:the same as the first stage feed-water temperature and absolute shell pressure D:not related to the feed-water temperature and absolute shell pressure

Which of the listed bearing types is an example of a solid bearing?

A:Piston wrist pin bushing B:turbine bearing C:Spring bearing D:Diesel engine main bearing

To determine the main bearing clearance of a propulsion diesel engine, you should measure the main bearing shell using a ball anvil outside micrometer and measure the crankshaft journal using a/an ________.

A:telescoping B:ring ‘snap’ gauge C:inside vernier caliper D:outside micrometer

Ultrasonic testing is used to determine the thickness of a vessel's shell plating and to ______．

A:Provide tailshaft clearances B:Test welds for subsurface defects C:Check the wear of the rudder carrier bearing D:Test the links of the anchor cables while being ranged