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名词解释题
能量流动（Energy Flow）
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考题
线性能量传递(linear energy transfer，LET)是指A、每单位径迹中心轴上长度介质吸收的能量B、单位径迹长度介质吸收的能量C、每单位径迹中心轴上长度发散的能量D、高能射线在单位径迹中心轴上发散的能量E、以上都不对
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有关生态系统中能量流动的叙述不正确的是（）A、生态系统中能量流动是从太阳辐射光能开始的B、生态系统中流动的能量几乎全部来源于太阳能C、生态系统中的能量流动是逐级递减和单向流动的D、生态系统离开外界环境的能量供应就无法维持
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能量流动是指生态系统中能量的输入、传递、转化和散失的过程。下列关于能量流动的叙述，正确的是（）A、能量沿食物链单向流动B、能量沿食物链循环流动C、能量在各营养级间可以循环利用D、消费者的级别越高，所获得的能量越多
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在工作点处，泵提供给流体的能量与流体在管路系统中流动所需的能量关系为（）。A、泵提供的能量大于流体在管路系统中流动所需的能量B、泵提供的能量小于流体在管路系统中流动所需的能量C、泵提供的能量等于流体在管路系统中流动所需的能量D、以上说法都不正确
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What Netflow component can be applied to an interface to track IPv4 traffic?（）A、flow monitorB、flow recordC、flow samplerD、flow
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生态系统能量流动的基本特点，下列叙述不正确的是（）。A、能量沿着生产者、消费者、分解者这三大类群顺序流动B、能量流动是单向的，不可逆转，但可以循环C、能量流动遵守热力学第一定律、第二定律D、能量流动是生态系统中生物与环境、生物之间能量的传递与转化过程
考题
下列关于生态系统捕食链中能量和物质的叙述，正确的是（）。A、物质是单向流动，是不循环的B、物质是单向流动，是可循环的C、能量是单向流动，是不循环的D、能量是单向流动，是可循环的E、能量是伴随着物质而流动的F、能量不是伴随着物质而流动的
考题
单选题_____ to flow spontaneously from a block of ice to a surrounding volume of water, this could occur in complete accord with energy conservation.A
There were energyB
There was energyC
Were energyD
If energy is
考题
单选题Since heat will not flow freely from a body at a （） temperature to another at a （） temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.A
lower；higherB
shallower；deeperC
larger；smallerD
higher；lower
考题
单选题Which of the following statements is true concerning centrifugal pumps?（）A
They are particularly suited for pumping high viscosity fluidsB
They are started with the discharge valve openedC
The flow of liquid is developed by imparting energy due to the rotation of an impellerD
They are always mounted in a horizontal position
考题
单选题______ to flow spontaneously from a block of ice to a surrounding volume of water, this could occur in complete accord with energy conservation.A
There were energy B
There was energyC
Were energyD
If energy is
考题
单选题A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.A
mechanical energy to kinetic energy to potential energyB
mechanical energy to potential energy to kinetic energyC
potential energy to mechanical energy to kinetic energyD
kinetic energy to mechanical energy to potential energy
考题
单选题According to the passage, why couldn’t PET and functional M. R. I. scans detect subtle changes in blood flow earlier?A
Because there is early oxygen transfer.B
Because they do not form their images quickly enough to follow such rapid changes.C
Because researchers control the changes in blood flow.D
Because early oxygen transfer gives the flow blood energy.
考题
单选题线性能量传递（1inear energy transfer，LET）指的是（ ）。A
每单位径迹中心轴上长度介质吸收的能量B
单位径迹长度介质吸收的能量C
每单位径迹中心轴上长度发散的能量D
高能射线在单位径迹中心轴上发散的能量E
以上都不对
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