单项选择题
A.dial indicator
B.outside caliper
C.bridge gauge
D.tram rod
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 （）
单项选择题 The ignition quality of a diesel fuel oil is indicated by the （）