单项选择题
A.To satisfy B.To be satisfied C.After satisfying D.After being satisfied
Cooling （） the engine metals retain their mechanical pr...
单项选择题Cooling （） the engine metals retain their mechanical properties.
A.forces B.enables C.makes D.is able to
The data to be recorded on this sheet （） the performanc...
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
To assist separation of low viscosity oils steam coils ...
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
