碳素钢中杂质硫、磷的含量越多,则钢的质量越好。( )
参考答案:错
_____sustainable development, measures are being drafted to control rising prices.[ ]
A. For the sake of
B. In favor of
C. In case of
D. In memory of
常用于空胶囊壳中的遮光剂是().
A.二氧化硅
B.二氧化钛
C.二氯甲烷
D.聚乙二醇400
E.聚乙烯吡咯烷酮