火灾自动报警系统施工前,应具备()以及消防设备联动逻辑说明等必要的技术文件。
A、系统图
B、设备布置平面图
C、接线图
D、安装图
参考答案:A, B, C, D
小敏在预习“勾股定理”,她在“百度”搜索引擎中输入“勾股定理”,能搜索到与之相关的结果个数约为12 500 000,这个数用科学记数法表示为( )
A.1.25×107
B.0.125×108
C.12.5×109
D.0.0125×1010
—My brother fell down from his bike and hurt his leg.
— _____. [ ]
A. That's too bad.
B. He's too careless.
C. He should be careful.
D. I'm sorry to hear that.