单项选择题An aluminum piston has lower inertia and higher coefficient of () compared to that of cast iron.

A.viscosity
B.twisting moments
C.inertia
D.thermal expansion


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1.单项选择题Among the rings of a piston the () one is subjected to the greatest load and temperature.

A.bottom
B.middle
C.top
D.none of the above

2.单项选择题Aluminum pistons have () coefficient of thermal expansion compared with those of cast iron.

A.higher
B.lower
C.the same
D.none of the above

3.单项选择题Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of () to develop their full strength.

A.the piston rods
B.the crank throws
C.the thrust bearings
D.the main bearings

5.单项选择题All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during () for new piston rings.

A.the running-in period
B.the running process
C.gas exchange process
D.the boiler firing

6.单项选择题Air cocks, usually positioned at the () in a circulating system, is used to get rid of the air in the system.

A.bending joint
B.expansion tank
C.weld
D.the highest point

7.单项选择题After the order “()” is given, the air system is shut down, the turning gear put in.

A.Finished with Engine
B.Stop the Engine
C.Stand-by Engine
D.Slow-down Engine

9.单项选择题After passing through the turbine the exhaust gas is conducted out into the().

A.intercooler
B.compressor
C.cylinder
D.open air

10.单项选择题After fitting back in place the gear wheels, dont forget () them.

A.to grease
B.greasing
C.oiling
D.lubricating