单项选择题

Since the burning or combustion takes place within the engine itself, the engine is known as （）.

A.a fire -tube boiler
B.an internal combustion engine
C.an external combustion engine
D.an internal combustion generator

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单项选择题

A.the bearing clearances
B.the bearing thickness
C.the bearing strength
D.the bridge hardness

单项选择题

A.on top cover
B.on sides of bowl
C.in drain line on the discs
D.on the discs

单项选择题

A.low specific heat
B.high specific heat
C.corrosive action
D.high viscosity