单项选择题
A.inefficient cooling B.a leaking air start valve C.a clogged drain valve D.a leaking air bottle
A high temperature alarm or （） which will melt is used ...
单项选择题A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.
A.a flame trap B.a relief valve C.a fusible plug D.a bursting cap
A heater in the circuit facilitates warning of the engi...
单项选择题A heater in the circuit facilitates warning of the engine prior to （） by circulating hot water.
A.starting B.stopping C.to start D.to stop
A gudgeon pin in a trunk piston may be free to float an...
单项选择题A gudgeon pin in a trunk piston may be free to float and rotate, with （） to limit axial movement.
A.split pins B.crankpins C.dipsticks D.circlips
