[单选题]In the constant-tension mooring, the mooring lines holding the ship to the pier will maintain a constant tension even with changes in tide or ship’s draft, _____.
[单选题]_____is an opening for supplying seawater to condensers, pumps, etc, located in the hull below the waterline.
[问答题]A two-ram hydraulic gear consists of a hydraulic ram situated on the port side of the tiller and another ram on the starboard side, linked at their outer ends to the tiller arm by a crosshead and swivel block, the other ends of the rams working inside their own hydraulic cylinders and pipes connect these cylinders to a hydraulic pump. The tiller is firmly keyed to the rudder stock. The pump is of special construction and may be axial or radial design. The pump runs continuously in the same direction driven by an electric motor, and the position of a movable plate or a floating ring inside the pump controls the suction and discharge of the oil. When the plate or ring is in mid position, no oil is drawn; when the plate or ring is moved in one direction from mid position, oil is drawn from one cylinder and discharged into the other; when the plate or ring is moved in the opposite direction, the suction and discharge of the oil is reversed in direction. The plate or ring is actuated by a control rod which is attached at its outer end o the hunting gear. A four-ram hydraulic steering gear may be fitted in large ships for greater steering power, instead of the tow-ram type. It is simply a double tow-ram unit, so that the force of tow diagonally opposite rams can act on the tiller to produce double the turning effect. The pump control is moved by the telemotor through a floating lever. The other end of this lever is connected through a safety spring link to the rudder stock or tiller. The telemotor is the receiver of the hydraulic remote control system from wheel on the bridge. The linkage through the floating lever of telemotor, pump and rudder stock forms the hunting gear.
[单选题]Which of the equipment listed is most effective in processing bilge slops for overboard discharge?
[单选题]When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the _____ .
[单选题]To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the____ .