推到精馏塔操作线方程的前提是（）
A、恒摩尔流
B、平衡精馏
C、板式塔
D、过程稳定（定常）
参考答案：D
Most of the students in our class like to read China Daily, which________every day. [ ]
A. comes out
B. comes up
C. come across
D. comes about
设有定义：int a；float b；执行scanf("％2d％f",&a,&b)；语句时,若从键盘输入876543.0<回车>,a和b的值分别是【 】。
A．876和543.000000
B．87和6.000000
C．87和543.000000
D．76和543.000000
