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检验钢质设备完好性的方法之一是：在被怀疑有裂纹处涂上10%的盐酸，过一段时间后，若看到有粗线裂纹，表明该部分原先确有裂纹。产生粗线裂纹的原因是

A．裂纹处尘埃多，起催化作用 B．裂纹处里面含有水份

C．裂纹处铁的表面积大，反应快 D．原裂纹处的铁锈跟盐酸作用，生成可溶性氯化物