A、ever know
B、ever knew
C、have ever known
D、are knowing
更多“It's one of the coolest springs we（）”相关的问题
A、Because the piston is exposed to very high temperature, it must be cooled B、The lower the piston cooling temperature is, the better it is C、Both water and lube oil can be used as coolant D、One of the piston cooling methods is vibration cooling, with better effect
A、Cooling the air to a temperature just above dew point B、Heating the air to a point at which moisture will boil off ,then re-cooling it C、Cooling the air to a point below dew point, then reheating it D、Heating the air and then cooling it to a point below dew point
A、A.the central cooling system, different B、B.the central cooling system, the same C、C.the open cooling system, different D、D.the open cooling system, the same
A、causes colloid suspension in the cooling water B、reduces the capability of the lubrication system C、can form pockets which block the flow of coolant through the system D、leads to the scuffing of cylinder walls
A、one meter from the tank bottom and one meter below the tank top B、one half the ullage of the tank and one meter below the tank top C、one half the ullage of the tank and one meter above the tank bottom D、at three meter intervals from the tank top to the bottom
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