【正文】 bedplate. A. the fuel oil B. the lubricating oil C. the refrigerating oil D. the hydraulic oil 2481 Two main lubricating oil pumps are usual and are obligatory必須的 in_____. A. container ships B. bulk carriers C. passenger ships D. barges 2482 Starting air for auxiliary engines may be taken directly from the main reservoirs or through_____. A. an auxiliary reservoir B. a controlling air bottle C. an emergency air pressor D. a main air pressor 2483 An auxiliary reservoir for starting auxiliary engines should be kept at_____. A. low pressure at all times B. full pressure at all times C. low pressure at intermittence D. full pressure at intermittence 2484 The minimum number and capacity of bilge pumps and fire pumps and their dispersement布置 within the ship is governed by_____. A. Classification Society Rules B. National requirements C. The IMO International Convention for the Safety of Life at Sea D. All of the above 2485 The fire pumps must be capable of delivering a total quantity of water at a defined head, not less than_____ of the total bilge pumping capacity. A. onethird B. twothirds C. onefourth D. twofourths 2486 An emergency bilge pumping system is provided and should be_____ of the main bilge pumping system, according to the SOLAS 74 Convention. A. dependent B. independent C. in series D. in parallel 2487 When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes_____. A. a line B. a circle C. a helix D. an epllicate 2488 If a line at right angles to the axis rotates about that axis and, at the same time, moves parallel to the axis, it will generate_____. A. a helix B. a helicoidal螺旋面 C. a curve D. a cone 圓錐體 2489 If the pitch of a propeller is constant throughout the length and breadth of the blade, it is said to be of_____. A. constant pitch B. variable pitch C. uniform pitch等螺距 D. nonuniform pitch 2490 If the pitch varies radially or circumferentially, the propeller is said to be of_____.（長度和寬度方向變化） A. constant pitch B. variable pitch C. uniform pitch D. nonuniform pitch 2491 The pitch ratio螺距比 of a propeller is the mean pitch divided by_____. A. the propeller diameter B. the propeller radius C. the pitch angle D. the length of helix 2492 When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as_____. A. ahead direction B. astern direction C. righthanded向右旋地 D. lefthanded 2493 Wake興波 varies considerably with the form of the vessel, but, generally speaking, the bluffer 非流線型 的 the ship_____ the wake value. A. the higher B. the lower C. the faster D. the slower 2494 In moving forward, a ship imparts forward motion to the water at the sterns, this is known as_____. A. the speed of the vessel B. the speed of the propeller C. the wake D. the wake fraction 2495 A propeller of in diameter, having a mean pitch of , turning at 72 rpm, at a speed of 11 knots (), will give_____ of apparent slip. A. B. C. D. 2496 A (n)_____ is a chemical or electrochemical attack on the metal surface which may be further increased if the seawater is polluted. A. erosion剝蝕 B. corrosion侵蝕 , 腐蝕 C. cavity D. scouring沖刷 , 沖蝕 2497 A(n)_____ is a mechanical attack on the metal surface which may be due to a disturbance in the flow of the water over the blade of the propeller. A. erosion剝蝕 B. corrosion C. pitting D. dezincification脫 鋅 2498 Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be_____ to maintain ambient conditions within the fort zone適宜室溫 (范圍 ) by air conditioning . A. possible B. necessary C. practicable D. impracticable 2499 Mooring winches are often bined with_____ units so that one prime mover drives both. A. crane B. hatch cover C. windlass D. steering gear 2500 The most mon forms of main drive used on deck auxiliaries are_____. A. steam plants, electric motors and pressed air B. diesel engine, hydraulic machinery and pressed air C. steam plants, electric motors and hydraulic machinery油船的貨油泵用的是蒸汽。s official logbook, shall be kept on board and preserved for a period of_____. A. 3 years after making the first entry B. 2 years after the last entry C. 3 months after last entry D. 3 years after the last entry 2458 At an unsheltered anchorage開敞錨地 the chief engineer officer shall consult with_____ whether or not to maintain an underway watch航行班 . A. the engineer officer in charge of watch B. the deck officer in charge of watch C. the master D. the chief mate 2459 In some cases facilities may be provided for emergency overriding oil pressure超油壓 shutdown, if this facility is used, adequate warning must be given to_____. A. the bridge watchkeeper B. the captain C. the chief engineer D. the engine room staff 2460 With UMS, when the engine room is unwatched,_____ will control the main engine.