A.a exhaust valve
B.a piston skirt
C.a piston crown
D.an air suction valve
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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
A.make
B.cause
C.result
D.produce
A.boiler
B.heater
C.engine
D.cooler
A.to retain
B.to remain
C.to maintenance
D.to have
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