报火警时应说明哪些情况？

A. 皮内注射
B. 皮下注射
C. 口服
D. 吸入

A. 防尘
B. 防污
C. 防爆
D. 防腐

A. about one-quarter of the vessel's length from the stern
B. at the bow
C. about one-third of the vessel's length from the bow
D. aft of the propeller