单项选择题

( )是确定管段管径和管道水头损失以及给水系统所需压力的主要依据。 A.
最高日用水量 B.
最大小时用水量 C.
给水当量 D.
给水设计秒流量

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（）更容易使消费者识别，形成统一的印象。
A . 一元化结构模式
B . 商标结构模式
C . 多元化结构模式
D . 两元化结构模式

单项选择题

Why Kenneth Thompson decided to write his own operating system? A.
He tried to realize his dream. B.
Bell Labs required him. C.
He wanted to start his own business. D.
He wanted a decent system on which to run his game.