单项选择题
（） that everything in the engine crankcase is correct, start up the crankcase lubricating oil pump.
A.To satisfy
B.To be satisfied
C.After satisfying
D.After being satisfied
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单项选择题
Cooling （） the engine metals retain their mechanical properties.
A.forces
B.enables
C.makes
D.is able to -
单项选择题
The data to be recorded on this sheet （） the performance of the engine.
A.makes the experts to judge
B.enables the experts to judge
C.make the experts judging
D.enable the experts to judge -
单项选择题
To assist separation of low viscosity oils steam coils or electric heaters are fitted （） of the oily water separator.
A.in entrance
B.in exit
C.in the upper part
D.on the outside
