A.downwards/upwards
B.upwards/downwards
C.downwards/downwards
D.upwards/upwards
第1题
A.leaking unloader
B.tripped circuit breaker
C.control line leak
D.defective pop valve
第2题
A.Fuel
B.Lubricating
C.Cooling
D.Ignition
第3题
A.crankcase
B.piston
C.cylinder liner
D.crank cheek
第4题
A.around the engine
B.around the cooler
C.to the expansion tank
D.overboard
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!