单项选择题
A.unusually solid welded B.never be solid forged C.almost invariably solid forged D.almost invariably be welded
Cracks in the cylinders and cylinder covers may （） uneq...
单项选择题Cracks in the cylinders and cylinder covers may （） unequal heating.
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
