单项选择题
A.deflection B.discrepancy C.error D.tolerance
Before replacing a piston you should check the rings to...
单项选择题Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.
A.above B.at C.over D.within
Before replacing a piston you should check that all rin...
单项选择题Before replacing a piston you should check that all rings are （）.
A.free B.fastened C.broken D.stuck
Before pumping up the crankcase oil,（） should be worked...
单项选择题Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.
A.the indicators B.the starting valves C.the cylinder lubricators D.the turning gear
