精馏塔正常操作时应注意的三大平衡之一是（）
A、热量平衡；
B、循环水平衡；
C、采出平衡。
参考答案：A
— He was chosen to be a volunteer of the Olympic Games.
— Great! No one speaks English _______ him.
A．as beautiful as
B．as badly as
C．worse than
D．better than
同样浓度食盐的渗透性比麦芽糖（）。
