常用的建筑消防设施有哪些?
参考答案:
常用的有火灾自动报警系统、自动喷水灭火系统、消火栓系统、气体灭火系统、泡沫灭火系统、干粉灭火系统、防烟排烟系统、安全疏散系统等。
Half of the class done most of the work. The rest rather difficult.
A.has, is
B.have, are
C.have, is
D.has, are
It took us several hours to make the old man _____ of the safety of travelling by air.[ ]
A. believed
B. convinced
C. informed
D. persuaded