A.specific gravity
B.viscosity
C.acid value
D.calorific value
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A.temperature
B.pressure
C.acid value
D.viscosity
A.piston
B.fuel injection pump
C.crankshaft
D.oil can
A.four-stroke
B.two-stroke
C.slow speed
D.reversible
A.clearance；calipers
B.sinking；bridge gauge
C.diameter；bridge gauge
D.clearance；lead wire
A.to stiffen
B.to soften
C.to loosen
D.to wear
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