Therefore, each piece of explosion-proof products shall mark or explain the explosion-proof type.
因此，每一款防爆产品都应当标注或者说明其防爆的类型。
QB type explosion-proof hook bridge crane work level is intermediate.
QB型防爆吊钩桥式起重机工作级别为中级。
QB type explosion-proof hook bridge crane work level is intermediate.
QB型防爆吊钩桥式起重机工作级别为中级。
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