汽油机热平衡中，转化为有效功的热量约占总热量的（）
A.25%~30%
B.20%~25%
C.30%~35%
D.30%~40%
参考答案：B
I would appreciate ______ if you could give me a reply as soon as possible.
A．you
B．it
C．that
D．them
184960≈______万．
