（）选择使用红外对射、电磁感应或电子脉冲围栏等技术进行周界防范，利用声、光、电等手段

— What do you think of the suggestion ____ he put forward at the meeting yesterday?

— Personally I don't agree to the suggestion ____ we should spend less money on the project. [ ]

A. which; that

B. that; which

C. which; which

D. what; that

医疗上常用生理盐水给病人补充体液．现有0.9%生理盐水500g，该溶液含溶质氯化钠______g，可由10%的氯化钠溶液______g稀释得到．

煤气管道的气密性试验包括哪几部分？

智能楼宇中生活给水系统采用恒压(或变压)供水形式时，其特点不包括( )。

A．供需水量相匹配
B．节约能源
C．增加设备和建筑面积
D．节省设备和建筑面积