建筑给水系统为使用和检修要求设置阀门,下列选项设置错误的是______。
A.入户管起始端 B.各种设备的配水管上C.各立管的起始端 D.配水点大于8个的配水支管
参考答案:B
下图是2008年北京奥运会主体育场的外观效果图,其仿生学设计灵感源自
A.鸟巢
B.鸟的骨架
C.鸟的翼
D.鸟的气囊
I'm impressed with his persistence. When he had a problem to solve, he________work at it until he
found an answer. [ ]
A. would
B. might
C. must
D. should