A . electric
B . heat
C . mechanical
D . exhaust
[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
[问答题]It is well known that coal is an important source of energy.
[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
[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
[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