A VLCC（100，000 DWT+）with a 30，000 Shaft Horsepower Steam Turbine is slow to respond to engine movements and has less stopping power than normal ships because it has a ______．A.Bigger propellerB.Smaller power weight ratioC.Smaller propellerD.Larger power w

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A VLCC（100，000 DWT+）with a 30，000 Shaft Horsepower Steam Turbine is slow to respond to engine movements and has less stopping power than normal ships because it has a ______．

A.Bigger propeller

B.Smaller power weight ratio

C.Smaller propeller

D.Larger power weight ratio

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Geothermal(地热)Energy1 Since heat naturally moves from hotter regions to cooler ones, the heat from the earth's center flows outwards towards the surface. In this way, it transfers to the next layer of rock. If the temperature is high enough, some of this rock melts and forms magma(岩浆). The magma ascends in its turn towards the earth's surface. It often remains well below the earth's surface, creating vast areas of hot rock. In such regions, there are deep cracks, which allow rainwater to descend underground. Some of the heated rainwater travels back up to the earth's surface where it will appear as a hot spring. However, if this ascending hot water reaches a layer of impermeable(不可渗透的)rock, it remains trapped, forming a geothermal reservoir. If geothermal reservoirs are close enough to the surface, they can be reached by drilling wells. Hot water and steam shoot up the wells naturally, and can be used to produce electricity in geothermal power plants.2.A few geothermal power plants depend on dry-stem reservoirs which produce steam but little or no water. In these cases, the steam is piped up directly to provide the power to spin a turbine generator. The first geothermal power plant, constructed at Lardarello in Italy, was of this type, and is still producing electricity today.3.Most currently operating geothermal power plants are either "flash" steam plants or binary(双重的)plants. Flash plants produce mainly hot water ranging in temperature from 300° to 700°Fahrenheit. This water is passed through one or two separators where released from the pressure of the underground reservoir, it "flashes" or boils into steam Again, the force of this steam provides the energy to spin the turbine and produce electricity. The geothermal water and steam are then reinjected directly back down into the earth to maintain the volume and pressure of the reservoir. Gradually they will be reheated and can then be used again.4.A reservoir with temperatures below 300° Fahrenheit is not hot enough to flash steam but it can still be used to generate electricity in binary fluid. The steam from this is used to power the turbines. As in the flash steam plant, the geothermal water is recycled back into the reservoir. 文章(23~30)Paragraph1_____A.Dry steam plants B.Binary plants C.Origin of geothermal energy D.Generation of electricity E.Flash steam plants F.Recyclable water and steam

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第2题

A dry-steam reservoir produces steam with _____.A.the energy to turn a turbine B.impermeable rock C.one or two separators D.turbine operator E.little or no water F.hot springs

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第3题

某公司的销售额为$100，000，变动成本为$60，000，固定成本为$30，000。则经营杠杆系数为（）A、0.1B、0.3C、0.4D、4.0

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第4题

如果EICAS在极限模式，显示选择面板的哪些选择会影响显示（）。A、ENG，GEAR，FUELB、ENG，FUEL，AIRC、ENG，DOOR，FUELD、ENG，ELECT，AIR

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第5题

如果项目有70%的概率获得￥100，000的利润，30%的概率获得￥100，000的损失，项目的预期货币值EMV是：（）A、￥100，000利润B、￥70，000损失C、￥40，000利润D、￥30，000损失

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第6题

某公司的息税前利润为$100，000，所得税为$30，000，利息支出为$10，000。公司的利息偿付率为（）A、6B、7C、9D、10

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第7题

ENG1及ENG2的反推使用（）A、ENG1用SYSA及SYSBB、ENG2用SYSA及备用C、ENG1用sysA及备用D、ENG2用SYSA及SYSBC

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A VLCC(100,000 DWT＋)with a 30,000 Shaft Horsepower Steam Turbine is slow to respond to eng

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