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1.A sudden change in the
E: caused (by the operation….)
A: general (determine the insulation..)
B: on both (the cost of transmission…)
C: can occur (at both opening and closing..)
D: limited (by means of circuit breaker…)
2.Circuit breaker are
B: required (to control electrical power..)
D: be able (to switch the current which can be…) A: upon (to perform any switch operation…)
E: reliability (of the highest important for…)
C: importance (of he circuit breaker)
3.Electrical energy conservation
C: for (reducing the thermostat up in the..)
D: companies (making use of alternative clean..)
E: atmosphere,(contributing to climate change..)
A: or(turning the thermostat up in the summer..)
B: people (Looking for other opportunities for..)
4.Electrical energy is the presence
D: such as (static electricity)
E: store the (electrical charge)
B: concept of (electrical energy)
A: battery.(Alternating current)
C: (Electrical potential) is essential
5.Elestric power is a most
C: time (the lack of electricity(a blackout)
B: that (its unavailability)
D: lead to (social disorder ,and even national tragedy) A: and (its growth rate)
E: Now (high electric power consumption per capita) 6.For pumped-storage
B: to height (is used to evaluate topographic….)
D: ratio (is the radio of horizontal…..)
A: difference (is most economic)
C: condition (is not desirable)
E: L/H value (is the best)
7.Fuel cells are
B: current,(there is no storage capacity..)
A: range, and (further developments is under…)
E: systems, but (as they are being developed..)
C: of 1 to 2.5V (many cells are operated in series…) D: used to (supply alternating current..)
8.In (B) such as U.S.A
B: In (some advanced countries)
D: unit has (great advantages on…)
E: in the (subcritical once-through boiler)
A: has a (good homogenization of distribution…) C: if (whole process management)
9.Many people think of alternative
A: system (sustainable)
D: One of (the best known is photovoltaic cells)
B: extremely (inefficient)
C: system (the collected energy is used to heat a fluid) E: more (efficient)
10.Many large cities
C: however,(there is still something..)
A: of waste (here is no time to be lost)
D: good (it can be put to use again)
E: Now,(more and more machines…)
B: so far, (building beautiful cities…)
11.Substations constitute.
C: substations (composed of a large number..)
A; development (substation automation technology..) E: construction,(all of which has become an..)
B: equipments,(simulation training technology..)
D: and (a full-digital automation system)
12.Steam is one
B: In (an electrically heated home)
E: Even if (the fuel is uranium and the…)
A: accomplished by(first generation steam)
D: 90%of (he new generating capacity…)
C: The (use of steam for electric….)
13.There are numerous examples
B: dollars in (the research and development)
D: between (the fake and real items)
A: of (new chemicals)
E: treated as (he intellectual property)
C: any other (physical property)
14.The aim of introducing
B: needs (a wholesale market…)
D: and needs (a retail market)
A: participants need (to register as a market customer..) E: free (to choose electricity suppliers…)
C: will need (to register as a marker customer)
15.The body that
B: moon,(It circuit the Earth…)
D: orbit 轨道（A satellite stays in…）
A: objects (The bigger and heavier…)
C:(To get out into space we have..)There
E: Mars (Artificial satellite can be used…)
16.The function of
C: The function of (power transmission)
E: balance between (power networks)
A: substations (step-down substations and….)
D: The (transmission at high voltage)
B: economy of (power network operation)
17.The misoperation
C: can lead to (accidents in the electrical operaton) E: connecting (the grounding wire (closing the…)
A: for (preventing the misoperation)
B: preventing (the closing of grounding switch…)
D: preventing (the persons from illegal entering….) 18.The secondary
B: system are (the equipments that provide…)
D: and (the equipments that send)
E: voltage and (current value in secondary system). A: winding and (5A rated current…)
C: voltages (50V rated…)
19.The high voltage power line throughhibernating
A: power is (transmitted from power plant…)
D: line is (the power line that transmits the..)

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