【正文】 ressure of an oil filter indicates that_____. A. it is dirty B. it is leaky C. it has been renewed D. all the above Jimei University 0303 Increasing the temperature of a fuel will reduce its_____. A. viscosity B. pressure C. resistance D. setting point著火點(diǎn) 0304 It is abnormal that when the engine is being turned by the turning gear or by hand, _____. A. water discharges from the indicator cocks B. no water is leaking into crankcase C. no water in the scavenge belt D. the rpm is lower than the speed of Dead Slow Ahead Jimei University 0305 It is important that the two condensate drain cocks, fitted to the underside of the air chest, _____ until the engine is placed on full load. A. remain open B. remain close C. retain open D. retain close * 發(fā)動(dòng)機(jī)啟動(dòng)時(shí) ， 凝水放殘考克應(yīng)保持在 打開(kāi)狀態(tài) ， 直到發(fā)動(dòng)機(jī)全負(fù)荷運(yùn)行 。 該句也是虛擬語(yǔ)氣 ， remain作聯(lián)系動(dòng)詞 ， 后面接形容詞 ，open在這里作形容詞 。 remain是不及物動(dòng)詞 ，retain是及物動(dòng)詞 ， 少了賓語(yǔ)所以不選 。 Jimei University 0306 It is important that the water _____ very often as this can lead to increased deposits. A. not be changed B. be changed C. should not be changed D. should be changed * 柴油機(jī)閉式冷卻系統(tǒng)中 ,冷卻水 不 應(yīng)該經(jīng)常更換 ,否則將會(huì)產(chǎn)生更多的沉淀物 .“it is important that… ”引導(dǎo)的從句中，應(yīng)使用 “ (should) + do (be done)”，表示語(yǔ)氣。主語(yǔ)從句中 should是可以省略的 ， 所以?xún)?yōu)先選省略的 。 Jimei University *0307 It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but_____ this amount. A. not less than twice B. greater at least twice than C. not greater twice than D. larger three times than It 作形式主語(yǔ)代替 不定式短語(yǔ) 。 *用壓鉛絲法調(diào)整 、 測(cè)量間隙時(shí) ， 鉛絲的厚度應(yīng)比正常的允許間隙大 ， 但一般不大于該值的兩倍 。 Jimei University 0308 It is necessary for us_____ after having served for a certain period. A. to change the lube oil B. have the lube oil purified C. have the lube oil burnt D. to analyze the lube oil 使用一段時(shí)間后，需要對(duì)滑油進(jìn)行 化驗(yàn)分析 。 本句 it也是代替不定式。 Jimei University *0309 It is necessary to_____ cool the various ponents of the machinery so that the engine can work properly. A. Continuously（ 有時(shí)間停斷 ） B. regularly C. constantly(連續(xù) 、 穩(wěn)定地 ) D. period 0310 It is necessary to remove_____ from the cooling spaces. A. scar傷痕 B. scale水垢 C. spur毛刺 D. bilge 0311 It is necessary to remove_____ from the cooling water spaces to improve heat transfer.(同 0310) A. lime石灰 B. frost C. scale D. scar Jimei University 0312 It is relatively_____ to drive the pressor directly from the engine by chain/or other mechanism because some of the additional power is absorbed. A. economical B. expansive (not economical) C. inexpensive D. loss *0313 It is usual to give the main diesel engine a brief trial on power ahead and astern before _____. A. the indicator cocks are closed B. Stand By is rang on the engine telegraph C. the engine is turned on by putting in starting air D. the steering gear is checked Jimei University *0314 It is very important that each cylinder should be_____ scavenged before the charged air is pressed. A. well B. good C. excellent D. respectively 0315 It is very necessary that each cylinder_____ before the charged air is pressed. “注意 (should) do (be done)形式” A. is scavenged B. is atomized with fuel oil C. be scavenged D. be atomized with fuel oil Jimei University 0316 It is very necessary that each cylinder_____ before the charged air is pressed. (同 0315) A. is scavenged B. has been scavenged C. be scavenged D. was scavenged 0317 It is well known that good lubrication will _____ the bearings from being overheated. A. present B. prevent C. avoid D. provide Jimei University *0318 Keep partment_____ as the gas given off can be dangerous. A. well ventilated B. well clean C. in good order D. more room 0319 Lack of bustion air may be due to_____. A. fouling turbine B. fuel pump faults C. lubrication failure D. excessive cooling Jimei University 0320 Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the_____ and a recirculation system lubricating the running gear and cooling the piston. (total loss system:全消耗系統(tǒng)，指氣缸潤(rùn)滑系統(tǒng) ) A. cylinder liners and piston rings B. main bearings C. crankpin bearings D. turboblower Jimei University *0321 Leaky exhaust valve will result in which of the following? (1) high exhaust temperature。 (2) low pression pressure。 (3) low firing pressure. A. (1) and (2) B. (1) only C. (2) only D. (1), (2) and (3) Jimei University *0322 Low pression of diesel engine may result from_____. A. a worn cylinder B. broken piston rings C. any of A and B D. none of the above *0323 Low pression results from ____. A. a worn cylinder B. broken piston rings C. either A or B D. none of the above Jimei University 0324 Lubricating oil for an engine is stored at the bottom of the_____, known as the sump or in a drain tank located beneath (under) the engine. A. sea chest B. air receiver C. crankcase D. water box 0325 Main bearings are required to support the crankshaft at each_____. A. end B. web C. pin D. journal Jimei University 0326 Marine fourstroke diesel engines are mainly_____. A. of crosshead type B. of trunk piston type C. of low speed type D. all the above