题目：
封铅时先用喷灯烘热铅包和铅封堵，用（）除去氧化层，再用焊锡将接口一圈焊住。
A、松香
B、盐酸
C、硬脂酸
D、焊锡膏
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
封铅时先用喷灯烘热铅包和铅封堵，用（）除去氧化层，再用焊锡将接口一圈焊住。A、松香B
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