A.a two-stroke engine can’t work without cylinders B.a two-stroke engine can’t work without pistons C.a two-stroke engine can’t work without crankshafts D.a two-stroke engine can’t work without a blower
A.will set B.shall set C.set D.sets
A.make clear of your authority B.make friends with ships crew C.call the first engineer if there is a problem D.call the master if there is a problem
A.popular B.common C.in lead position D.uncommon
A.more;more B.more;less C.less;more D.less;less