A. 腐蚀性物质 B. 易燃易爆性物质 C. 防护缺陷 D. 有毒物质
A. 对 B. 错
A. Lesser Fullness B. Xiaoman C. Spring water D. Both A and B
A.May 1-3 B. May 10-13 C. May 20-22 D. May 28-30