若热能转化为电能的效率为30%，则1kW.h的电量其等价热值为（）。
A.3600KJ
B.12000KJ
C.1080KJ
D.7200KJ
参考答案：B
—Do you know _______he came?
—I am not sure. Maybe for the toy car.
A．how
B．when
C．why
D．what
什么是正常停炉？故障停炉？紧急停炉？
