A transformer in an electric circuit serves to （）

A . insulate your shoes B . ground the fire hose C . secure its power supply D . start the fire pum

A . Use the CO system and evacuate the engine room B . Use the fire main system and evacuate the engine room C . Evacuate the engine room and use the CO system D . Evacuate the engine room and use the fire main system

A . alternator B . glass thermometer C . burdon tube D . piezoelectric pressure transducer

A . leaking unloader B . tripped circuit breaker C . control line leak D . defective pop valve

A . circuit breaker B . amplifier C . diode D . capacitor

A . (1) only B . (2) only C . both (1) and (2) D . neither (1) or (2)

A . Use the C0 system and evacuate the engine room B . Use the fire main system and evacuate the engine room C . Evacuate the engine room and use the C0 system D . Evacuate the engine room and use the fire main system

A . An alternator B . An electric motor C . A diesel engine D . A main switchboard

A . hydraulic system B . pneumatic system C . spare battery D . hand crank

A . Class "A" B . Class "B" C . Class "C" D . Class "D&quot

A . small wire brush B . compressed air jet C . clean dry cloth D . 10% solution carbon solvent and water

A . wasted energy B . efficient operation C . a short in the exciter field windings D . an excessive number of minor system ground

A . cannot be detected tinder normal conditions B . is of no consequence to engineering personnel C . is indicated at the branch circuit breaker panel D . is indicated by the ground detecting lamps on the main switchboard

A . Frequency meter B . Ohmmeter C . Induction voltage regulator D . Current transformer governor

A . prevent the windings from becoming brittle B . prevent moisture from condensing in the windings during shutdown C . prevent acidic pitting of the slip rings D . keep the lube oil warm for quick starting

A . limit B . monitor C . modulator D . interlock

A . flush water over any burned area of the patient B . apply ointment to the burned areas on the patient C . get assistance to shut down electrical power in the area D . remove the patient from the vicinity of the live electrical equipment or wiring

A . manoeuvring operations B . bad combustion C . cooling D . mooring trial

A．deep structure B．surface structure C．primary structure D．secondary structure

Most people tend to think of electric cars as a new 6 ____, but they have been around for a long time. In the 7_____ 19th and early 20th centuries electric cars were common because the technology for petrol engines was not very advanced.But 8____ the petrol engine became easier to make and more powerful, this type of engines became the most 9 ____.Interest in electric cars was high in the l970s and 1980s because 10____ became very expensive.Recently, electric cars have again become well-liked because people want cars that pollute 11_____. Electric cars are better than petrol cars 12______ several ways. The biggest benefit is reduced pollution.In areas 13_____ there is a high percentage of electric cars, pollution is not that serious. The second benefit of electric cars is a 14 _____in the dependence on foreign oil.Several countries don’t want to 15 _____on oil from other countries. Since electric cars can run on electricity from coal or nuclear power stations, there is less need to import oil. (15分) (1)第1题最佳答案应选()(1分) A. But B. Nor C. Or D. And (2)第2题最佳答案应选()(1分) A. traditional B. common C. same D. special (3)第3题最佳答案应选()(1分) A. summary B. detail C. time D. addition (4)第4题最佳答案应选()(1分) A. all B. both C. either D. neither (5)第5题最佳答案应选()(1分) A. described B. regarded C. called D. known (6)第6题最佳答案应选()(1分) A. invention B. influence C. instrument D. intention (7)第7题最佳答案应选()(1分) A. last B. beginning C. recent D. late (8)第8题最佳答案应选()(1分) A. unless B. after C. before D. until (9)第9题最佳答案应选()(1分) A. popular B. comfortable C. difficult D. dangerous (10)第10题最佳答案应选()(1分) A. motors B. power C. cars D. oil (11)第11题最佳答案应选()(1分) A. much B. more C. less D. few (12)第12题最佳答案应选()(1分) A. by B. in C. at D. on (13)第13题最佳答案应选()(1分) A. when B. where C. what D. which (14)第14题最佳答案应选()(1分) A. start B. need C. reduction D. rise (15)第15题最佳答案应选()(1分) A. put B. hold C. rely D. keep

I chose to study engineering at a small liberal-arts university that doesn't even offer a major in electrical engineering. Obviously, this was not a practical choice; I came here for more noble reasons. I wanted a broad education that would provide me with flexibility and a value system to guide me in my career. I wanted to open my eyes and expand my vision by interacting with people who weren't studying science or engineering. My parents, teachers and other adults praised me for such a sensible choice. They told me I was wise and mature beyond my 18 years, and I believed them. I headed off to college, feeling sure I was going to have an advantage over those students who went to big engineering "factories" where they didn't care if you had values or were flexible. I was going to be a complete engineer: technical genius and sensitive humanist all in one. Now I'm not so sure. Somewhere along the way my noble ideals crashed into reality, as all noble ideals eventually do. After three years of struggling to balance math, physics and engineering courses with liberal arts courses, I have learned there are reasons why few engineering students try to reconcile engineering with liberal-arts courses in college. The reality that has blocked my path to become the typical successful student is that engineering and the liberal arts simply don't mix as easily as I assumed in high school. Individually they shape a person in very different ways; together they threaten to confuse. The struggle to reconcile the two fields of study is difficult. The author chose to study engineering at a small liberal-arts university because he ______. A．intended to be a sensible student with noble ideals B．wanted to be an example of practicality and rationality C．intended to be a combination of engineer and humanist D．wanted to coordinate engineering with liberal-arts courses in college 此题为多项选择题。