单项选择题
In some modern large diesel engines, which of the following is used as the support for the main bearings?（）
A.Bedplate B.Block C.Base D.Sump
单项选择题 Valve lash, or clearance refers to the （）
单项选择题 Auxiliary diesel engines can be automatically shut down as a result of （）
单项选择题 Which of the listed conditions can cause a diesel engine to use too much lube oil?（）
