单项选择题
The hand steering is a method by which the motion of the rudder is controlled with （）.
A.a motor-driven steering wheel B.a pneumatic steering wheel C.a hand-driven steering wheel D.an electric steering wheel
单项选择题 The gudgeon pin is carried in （） in the piston skirt.
单项选择题 The governor of a generator engine is to （）.
单项选择题 The gas loads on the engine structure are constrained by means of hydraulically preloaded （） which connect the bed plate, frame sections and cylinder jackets into a single unit.
