对于几个不会同时着火的相邻防护区或保护对象,可采用()。
A.单元独立气体灭火系统
B.组合分配气体灭火系统
C.管网气体灭火系统
D.无管网气体灭火系统
参考答案:B
国务院规定全国性及中央部门和单位行政事业性收费纳入预算管理的时间是什么?
I didn't know _____ yesterday.[ ]
A. why isn't Danny in school
B. why wasn't Danny in school
C. why Danny isn't in school
D. why Danny wasn't in school