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【多选题】
气焊与气割中使用焊割炬，应遵守下列哪些规定？（ ）
A.
工作前应检查焊、割枪各连接处的严密性及其嘴子有无堵塞现象，禁止用纯铜丝（紫铜）清理嘴
B.
焊、割枪点火前应检查其喷射能力，是否漏气，同时检查焊嘴和割嘴是否畅通
C.
不应使用小焊枪焊接厚的金属
D.
严禁在氧气和乙炔阀门同时开启或其他物体堵住焊、割枪嘴子的出气口，以防止氧气倒流入乙炔管或气瓶而引起爆炸
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