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浸火柴杆于本品水浸液中，使着色，干后再浸入盐酸中立即取出，于火焰附近烤，杆上发生深红色反应的药材是（）
A . A.海金沙
B . B.儿茶
C . C.芦荟
D . D.冰片
E . E.青黛
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在使用于粉灭火器时，由远及近，快速向前推进。
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