天然色素中，（）法生产的焦糖色由于可能有致癌物，不得用于酱油加色。
参考答案：加铵盐法
The businessman boasts to me that I can't find a ____ jade bracelet(玉镯), because his shop deals
in the best.[ ]
A. good
B. better
C. best
D. worse
位置公差可分为定向、定位和跳动公差三大类。( )
