火灾应急广播备用扩音机的容量要求?
参考答案:
火灾应急广播备用扩音机容量不应小于火灾时需同时广播的范围内火灾应急广播扬声器最大容量总和的1.5倍。
软件开发过程主要分为需求分析、设计、编码与测试4个阶段,其中______阶段产生“软件需求规格说明书”。
It is reported that between the year 1550 and 1950 about one kind of living things___each year .
A.died out
B.died of
C.died from
D.died down