The children were out and the room was . [ ]
A. noisy
B. loud
C. silent
D. quick
答案:C
现代城市规划形成的行政实践是指()。
A.空想社会主义
B.英国关于城市卫生和工人住房的立法
C.法国巴黎改建
D.公司城建设
一甲胺有何危险性?