【正文】 A. contraction B. retraction C. expansion D. shrinkage 1191 D 1192 B 1193 C 1194 B 1195 A 1195 In a ordinary cargo crane, _____ is fitted to rotate the crane. 在回轉(zhuǎn)式起貨機 (克令吊 )中，回轉(zhuǎn)裝置用于旋轉(zhuǎn)克令。 A. stop valves B. check valves C. safety valves D. reducing valves 1180 _____ are used for cargo (克令吊 )可用來進行貨物裝卸。 t discharge oil when pumping out _____見上題。 ② )increase feed pump pressure. 發(fā)現(xiàn)鍋爐水位表斷水，應(yīng)立即熄火，而不能盲目地增大給水泵的壓力?！?purge”意“驅(qū)氣”；而“ clear of air“清除空氣”。 A. increase discharge pressure B. increase suction vacuum C. develop pulsation flow D. keep a steady rate of flow 1129 The pipe friction and the resistance will ______ as a result of an increase in the amount of fluid flowing through the system. 系統(tǒng)流量增加時，管路摩擦和阻力將增大。 ① ejector。 A. ① only B. ① and ② C. ①② and ③ D. ② and ③ 1107 The amount of fluid delivered by a helical pump can be regulated by _______ 螺旋泵屬于容積式泵，排量只能通過改變轉(zhuǎn)子的速度來調(diào)節(jié)。 A. one B. two C. three D. four 1093 The gear and screw pumps are classified as ____ 齒輪泵和螺桿泵都屬于容積式泵。 A. throttling the pressure line B. changing the speed of the rotor C. either A or B D. None of the above is true. 1102 While flowing through the volute in a centrifugal pump, part of the _______ energy of the liquid is converted to _______ energy. 當(dāng)液體經(jīng)過離心泵的渦殼時，部分動能轉(zhuǎn)換成壓力能。 A. injector pumps B. positive displacement pumps C. centrifugal pumps D. centripetal pumps 1114 A _______ pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out. 對于容積式泵，泵腔室體積增大時吸人液體，體積減少時則排出液體。 ② . they are selfpriming。 A. in series B. in parallel C. either A or B D. None of the above is true 1133 If an operating auxiliary boiler has a water pH reading of 7, you should _____ 如果輔助鍋爐給水的 pH值是 7，則應(yīng)使用氫氧化鈉進行處理，使 pH值在 10左右； A. bottom blow the boiler B. treat the water with cat~stic soda C. treat the water with chemical scavengers D. reduce the water alkalinity to remended readings 1130 C 1131D 1132 A 1133 B 1134 The internal part of the boiler, if found _____ , has to be chemically washed by yard. 鍋爐內(nèi)側(cè)發(fā)現(xiàn)水垢，應(yīng)化學(xué)清洗。 A. one to supply steam to the main propulsion turbine B. an auxiliary boiler C. A and B D. neither A nor B 1149 The safety valves should be tested and adjusted when the boiler survey is _____ 當(dāng)進行鍋爐檢驗時，應(yīng)對鍋爐安全閥作試驗和調(diào)整。 ② tube failure。 A. purifying B. batch C. long period D. temporary 1173 For a purifier, changing to a gravity disc with larger hole diameter will move the interface towards the ___對于分水機，使用較大直徑的比重環(huán)，油水界面會向分離筒四周移動。 A. Relief valves B. Check valves C. Safety valves D. Reducing valve 1189 The rotor of the hydraulic motor rotates at a speed proportional to the _____ 液壓馬達轉(zhuǎn)子的回轉(zhuǎn)速度與油量有關(guān)，而與油壓無關(guān)。 A. Hydraulic oil B. Animal oil C. Light oil D. Fuel oil 1202 _____ is the production of pure water from sea water by evaporation and recondensing 通過蒸發(fā)和再冷凝，由海水產(chǎn)生淡水的過程稱為“蒸餾”。 A. The hydraulic pumps B. Valves C. Hydraulic cylinders D. Hydraulic motors l 187 Among the basic categories of equipment, which of the following is used to convert hydraulic energy into continuous rotary motion.? 在液壓系統(tǒng)中，液壓馬達將液壓能轉(zhuǎn)變?yōu)槌掷m(xù)的回轉(zhuǎn)運動。 A. center B. periphery C. inlet D. upper parts 1172 For many years marine centrifuges were designed for _____ operation, that is the machines were run for a period during which solids accumulated in the bowl. The machine was stopped when the accumulated solids began to impair its performance. 很多年以來，離心式分油機被設(shè)計成分批運行。這是因為鍋爐水是水和汽 泡的混合物 (水位表本身上端通汽下端通水 )，向鍋爐供水后，等汽泡凝結(jié)，水位反而下降。 1147 Safety valves on a boiler vent to the _____鍋爐安全閥通大氣。 ③ gear. ① ② ③ A. ① only B. ① and ② C. ② ③ and ③ D. ① ② and ③ 往復(fù)泵、齒輪泵和葉片泵都具有干吸能力。 ③ . screw. 齒輪泵和螺桿泵都是容積式泵，排出閥關(guān)閉’將會產(chǎn)生具有破壞性的壓力，而離心泵不會。 A. ① only B. ② only C. ① and ② D. ① ② and ③ l l 12 Shaft sealing in a centrifugal pump can be effected by _______ 離心泵的軸封可用機械密封，也可用填料箱。 C. triple screw pump D. centripetal pump 1100 A Screw pump belongs to _______ according to its working principle. 根據(jù)工作原理，螺桿泵屬于容積式泵。 A. depending on B. in relative to C. regardless of D. because of 1090 B 1091 A 1092 A 1093 C 1094 C 1095 A gear pump belongs to _______ according to its working principle. 根據(jù)工作原理，齒輪泵屬于容積式泵。 A. draw the liquid in/force the liquid out B. force the liquid out / draw the liquid in C. suction/draw D. deliver/outlet 1109 Throttling in the ______ line of a centrifugal pump involves the risk of the pump ，節(jié)流吸人管路，會產(chǎn)生氣蝕危險。 ③ centrifugal. 噴射泵和螺桿泵都具有干吸能力，而離心泵沒有。 A. reduce B. rise C. raise D. fall 1126 C 1127 A 1128 D 1129 B 1130 Which of the following will be the advantage of a centrifugal pump as pared with a reciprocating pump? ① Its discharge is continuous。 A. drop as the boiler warms up B. rise as the boiler warms up C. remain unchanged until the boiler is hot enough D. rise and fall with the