A.吊货索 B.吊桶钩 C.网吊 D.吊杆
A.Containers B.Trucks C.Machinery D.Clamps
A.工头 B.码头工人 C.装卸工人 D.领班
A.When B.Why C.What D.Either A or B
A. low-speed control B. inching control C. high-speed control D. slow-speed control
