【正文】 (2) low pression pressure。 本句 it也是代替不定式。 *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 。主語(yǔ)從句中 should是可以省略的 ， 所以?xún)?yōu)先選省略的 。 remain是不及物動(dòng)詞 ，retain是及物動(dòng)詞 ， 少了賓語(yǔ)所以不選 。 more fuel may now be burned giving an increased power. A. specific volume比容 B. density C. viscosity D. calorific value熱值 0302 Increasing differential pressure 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 。s the meaning of it in the sentence above? A. a separator B. oil C. water D. an oil collecting space 0263 In a diesel engine, fuel must be broken up into a spray of fine droplets to_____. A. increase its quality B. obtain plete burning C. reduce its weight D. all of the above Jimei University 0264 In a diesel engine, smoky exhaust may be an indication of_____. A. high pression B. bad water cooling C. excessive burning oil D. improper fuel grade(燃料品級(jí) ) *0265 In a fourstroke engines the camshaft rotates at_____. A. half the engine rotational speed B. twice the engine rotational speed C. the engine rotational speed D. four times the engine rotational speed Jimei University 0266 In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of_____. A. oil B. sea water C. air D. fresh water 0267 In a marine diesel engine the oil sump is_____. A. just below the crankcase B. the oil cup for the exhaust valve C. the pan for collecting drain fuel oil D. oil circulating pump Jimei University 0268 In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the_____. A. bowl periphery B. bowl center C. upper surface D. lower surface 0269 In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to_____. A. the outlet of oil B. the outlet of water C. the bowl（ 分離桶 ） periphery D. the center of bowl Jimei University 0270 In a twostroke engine the camshaft rotates at_____ the engine rotational speed. A. half B. twice C. the same speed as D. four times 0271 In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to_____ and heated. A. a service tank B. a collecting tank C. a sump D. a settling tank Jimei University 0272 In a typical fuel system , the oil is stored in_____ in the double bottom. A. setting tanks B. service tanks C. tanks D. drain tanks 0273 In addition to lubricating, cylinder oil assists in forming a gas seal and contains_____ which clean the cylinder liner. A. additives B. water C. grease D. acid solution Jimei University *0274 In an engine with a potshaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the_____. A. crosshead B. crankpin C. crank journal D. gudgeon pin 0275 In an engine with a potshaped piston, some lubricating oil from the main bearing will pass along a_____ in the crankshaft to the bottom end bearing and then up a connection rod to the gudgeon pin. A. telescopic pipes B. large bore C. drilled passage D. tied rod Jimei University 0276 In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder_____ and the gases exhaust _____, there being an adequate overlap between the inlet opening and the exhaust closing. A. downwards/upwards B. upwards/downwards C. downwards/downwards D. upwards/upwards Jimei University 0277 In an fourstroke engines the camshaft rotates at_____. A. half the engine speed B. twice the engine speed C. the engine speed D. four times the engine speed Jimei University 0278 In an oil cooler circulated by sea water, the oil is at a larger pressure, the result being that any leak in the cooler will mean a loss of_____. A. oil B. sea water C. refrigerant D. fresh water *0279 In an ordinary diesel engine the fuel injection begins_____. A. after TDC B. before TDC C. after BDC D. before BDC Jimei University 0280 In an ordinary fourstroke engine the exhaust valves open_____ A. after TDC B. before TDC C. after BDC D. before BDC 0281 In each cylinder cover is a large central opening for mounting_____. A. the in