Heat energy（）from the sun in a direct way is the most widely used energy today.

[单选题]We can use energy from the sun because ______.

As the name implies solar is the energy from the suns rays . The amount of energ

[单选题]Heat energy is a source of power, but （） will cause damage to the engine.A . excessive heatB . insufficient heatC . effective coolingD . high output

[单选题]As a heat engine,（） energy is the source of power by which the diesel engine can be operated.A . electricB . heatC . mechanicalD . exhaust

"Smart clothes"of the future will turn energy from the sun into electricity.A. 未

[单选题]According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and （）.A . the pulse-phase systemB . the pulse Doppler systemC . the pulse systemD . the pu

[单选题]Today the energy problem becomes critical. It ____ an immediate solution.A． calls on B calls for C calls up D calls at

[单选题]Solar energy is man's most important energy source. As the name implies, so

[单选题]Solar energy is man's most important energy source. As the name implies, so

[单选题]Solar energy is man's most important energy source. As the name implies, so