单项选择题
A.lifted B.reassembled C.dismounted D.disassembled
Persistent knocking in one cylinder of a diesel engine ...
单项选择题Persistent knocking in one cylinder of a diesel engine could be caused by（）.
A.a low load on that cylinder B.sluggish piston ring action C.excessive piston crown cooling D.excessive clearance of piston pin
Operating conditions in the crank chamber are very （） t...
单项选择题Operating conditions in the crank chamber are very （） those in the cylinder.
A.the same as B.similar to C.separated from D.different from
Opening of the cylinder （） will admit compressed air in...
单项选择题Opening of the cylinder （） will admit compressed air into the cylinder.
A.safety valve B.indicator cock C.blow-down valve D.start valve
