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 （）
A.telescoping B.ring ‘snap’ gauge C.inside vernier caliper D.outside micrometer
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 （）
单项选择题 Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）
