国药上的钾好贵!淘宝上搜索“金属钾”有一个叫“枫棂实验用品的”100克卖33元,加运费5元,大家建议我买吗?
网址:http://item.taobao.com/auction/item_detail-0db2-3b692a05c80fdeedc56518eab9a6ddf1.jhtml?cm_cat=0&pm1=1
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