A.regulate the fuel supply
B.maintain a constant fuel viscosity at the fuel valves
C.maintain efficient cooling
D.alter the fuel density
第1题
A.cetane number
B.flash point
C.viscosity
D.setting point
第2题
A.air compressor
B.diffuser
C.after-cooler
D.ventilator
第3题
A.two to four months
B.four to six months
C.six to eight months
D.year
第4题
A.a high suction head
B.rotating rings
C.badly worn bearings
D.a loose stuffing box gland
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