关于内能做功，以下说法正确的是___ The following statement about Internal Energy doing Work is true___

A．You use the same amount of energy whether you jog or walk for the same amount of time.

B．You use the same amount of energy whether you jog or walk the same distance..

C．You use more energy if you jog rather than walk the same distance.

D．You use more energy if you walk rather than jog for the same amount of time.

A、当合外力与非保守内力做功之和等于0，系统机械能守恒； When the sum of the Work done by the External Force and the Non-conservative Internal Force is equal to 0, the Mechanical Energy of the system is conserved;

B、当合外力与非保守内力做功之和等于0，系统动能守恒； When the sum of the Work done by the External Force and the Non-conservative Internal Force is equal to 0, the Kinetic Energy of the system is conserved.

C、当合外力与非保守内力做功之和等于0，系统势能守恒； When the sum of the Work done by the External Force and the Non-conservative Internal Force is equal to 0, the system Potential Energy is conserved.

D、当合外力与非保守内力做功之和大于0，系统机械能守恒； When the sum of the Work done by the combined External Force and the Non-conservative Internal Force is greater than 0, the Mechanical Energy of the system is conserved;

A.You use more energy if you walk rather than jog for the same amount of time．

B.You use more energy if you jog rather than walk the flalne distance．

C.You use the same amount of energy whether you jog or walk the sanle distance．

D.You usd the same amount of energy whether you jog or walk for the same amount oftime．

A.You use more energy if you walk rather than jog for the same amount of time．

B.You use more energy if you jog rather than walk the flalne distance．

C.You use the same amount of energy whether you jog or walk the sanle distance．

D.You usd the same amount of energy whether you jog or walk for the same amount oftime．

A．Energy from coal would not pollute our living environment．

B．Energy from natural gas would not pollute our living environment．

C．Energy from the sun would not pollute our living environment．

D．Energy from oil would not pollute our living environment．

A．Solar energy can be used for heating, washing, cooking and lighting.

B．Solar energy can only be used in a passive role now.

C．Solar energy can be fed directly into the national electricity grid.

D．Solar energy can become America's greatest property one day.

A．The demand for commercial products will not necessarily keep increasing.

B．Nuclear energy is something we cannot do without.

C．Uranium is good source of energy for economic and ecological reasons.

D．Greater safety provisions can bring about the expansion of nu clear energy programs.

A、IAEA is widely known as the world’s “Atoms for Peace and Development”.

B、The full name of IAEA is the International Atomic Energy Agency.

C、IAEA reports to both the United Nations General Assembly and Security Council.

D、Iran’s nuclear program is not subject to the IAEA's verification.

A．The sun shines constantly and gives out the same amount of energy every year.

B．The cause of the sun's fluctuations is its loss of energy with each passing year.

C．It is sure that the energy sent out by the sun will drop when more sun spots appear.

D．Fluctuations in weather patterns are the results of the pull of gravity.

A．It represents a preferable alternative to other fossil fuel resources.

B．Its use in the production of energy carries high costs.

C．Its drawbacks will be overcome by technology in the future.

D．It should completely replace oil and coal as the world"s energy source.