单项选择题

If wemore attention to the signboards, weour way.
A．had paid, would have lost
B．paid, would not lose
C．paid, would lose
D．had paid, would not have lost

A.
A．had
B.paid,
C.paid,
D.had

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有相对挥发度为2的理想溶液，用板式精馏塔分离。溜出液流量为100mol／h，回流比R=2，测得进入第n板的气液相组成分别为yn+1=0．8、xn-1=0．82，若塔板以气相组成表示的单板效率Emv=0．5，试计算离开第n板的气液两相组成。

A.8、xn-1=0．82，若塔板以气相组成表示的单板效率Emv=0．5，试计算离开第n板的气液两相组成。

单项选择题

If Helen______the doctor's advice, she would not be sick now.
A．should follow
B．had followed
C．has followed
D．follows

A.
A．should
B.had
C.has
D.follows