A.cooling water
B.compressing air
C.compressed air
D.cylinder oil
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A.sea water
B.fine mineral oil
C.sanitary water
D.fresh water
A.piston cooling
B.sleeve cooling
C.central cooling
D.jacket cooling
A.a exhaust valve
B.a piston skirt
C.a piston crown
D.an air suction valve
A.unusually solid welded
B.never be solid forged
C.almost invariably solid forged
D.almost invariably be welded
A.result from
B.result in
C.give out
D.given from
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