单项选择题
A.timing B.power C.firing order D.dead center
Engine （） refers to the relative time of position of cr...
单项选择题Engine （） refers to the relative time of position of crank, at which each operation during the cycle is commenced and is completed.
A.timing B.deviation C.firing order D.phase
Engage the flywheel with the （）.A.turning gearB.motorC....
单项选择题Engage the flywheel with the （）.
A.turning gear B.motor C.driving gear D.driven gear
Energy losses due to （） occur in every machine.A.speedB...
单项选择题Energy losses due to （） occur in every machine.
A.speed B.friction C.impact D.atmosphere
