A.water cooling
B.oil cooling
C.air cooling
D.combined cooling
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A.conflict
B.accord
C.harmonize
D.struggle
A.metering
B.control
C.using
D.timing
A.shockless
B.smokeless
C.no vibration
D.noiseless
A.cooling water
B.cooling oil
C.refrigerant
D.lubricate oil
A.nuts
B.screws
C.studs
D.flanges
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