[单选题]游泳时（），容易造成踩踏或撞伤意外事故发生。

正确答案 ：A

水中嬉戏

[单选题]关于火灾事故报告，下列哪种说法不正确?

正确答案 ：B

只有重大或特大火灾才报告

[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

正确答案 ：ABCD

weapons

explosives

hair mouse

ammunition

解析：ABCD

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