Objective To analyse the result of exterior quality control about 30 counties iodize salt labs.

目的对2001年30个县实验室外质控结果。

One of the attractions is that a campaign to iodize salt costs only 2 cents to 3 cents per person reached per year.

引人的一个原因是每年每人只要花费2到3钱就可以食用。