单项选择题
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
Once all cylinders are firing regularly, （） is shut off...
单项选择题Once all cylinders are firing regularly, （） is shut off.
A.the exhaust valve B.the starting air C.the inlet valve D.the fuel oil
