单选题:适用于在幼儿园、医院、养老院等场所,保护幼儿或行动不便的老弱病残者人身安全的灭火系统是( )。 题目分类:机电工程 题目类型:单选题 查看权限:VIP 题目内容: 适用于在幼儿园、医院、养老院等场所,保护幼儿或行动不便的老弱病残者人身安全的灭火系统是( )。 A.自动喷水灭火系统 B.气体灭火系统 C.干粉灭火系统 D.泡沫灭火系统 参考答案: 答案解析:
Which of the following statements about the telephone of the Which of the following statements about the telephone of the future is NOT true? 分类:机电工程 题型:单选题 查看答案
Sn为等差数列{an}的前n项和,S2=S6,a4=1,则a6=__________ Sn为等差数列{an}的前n项和,S2=S6,a4=1,则a6=__________ 分类:机电工程 题型:单选题 查看答案
It can be inferred from the text that the retail price of pe It can be inferred from the text that the retail price of petrol will go up dram 分类:机电工程 题型:单选题 查看答案