单项选择题
A.result from B.result in C.give out D.given from
Cracks in cylinder and cylinder covers may （） from uneq...
单项选择题Cracks in cylinder and cylinder covers may （） from unequal heating.
A.make B.cause C.result D.produce
Cooling of engine is achieved by circulation a cooling ...
单项选择题Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.
A.boiler B.heater C.engine D.cooler
Cooling enables the engine metals （） their mechanical p...
单项选择题Cooling enables the engine metals （） their mechanical properties.
A.to retain B.to remain C.to maintenance D.to have
