单项选择题
A.indicates the amount of abrasive material in the fuel
B.affects the starting ability of a cold engine
C.determines the amount of fuel penetration engine
D.affects the compression ratio of an operating engine
单项选择题 On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）
单项选择题 To determine the main bearing clearance of a propulsion diesel engine, you should measure the main bearing shell using a ball anvil outside micrometer and measure the crankshaft journal using a/an （）
单项选择题 The ignition quality of a diesel fuel is indicated by the （）