1. [单选题]游泳时（），容易造成踩踏或撞伤意外事故发生。
A. 水中嬉戏
B. 水中滑行
C. 呛水
D. 打腿
2. [单选题]关于火灾事故报告，下列哪种说法不正确?
A. 对所有火灾都应报告
B. 只有重大或特大火灾才报告
C. 自行熄灭火灾也应报告
3. [多选题]Procedures for the proper control and screening of checked baggage are designed to prevent ()from being introduced into the baggage compartment of an aircraft
A. weapons
B. explosives
C. hair mouse
D. ammunition
