原料中含有沥青质。
参考答案:对
Steve isn’t as ______ as Kelly. He often makes mistakes in his writing.
A.careless
B.tidy
C.careful
D.difficult
下列哪项不是当今的质量观点()。
A.应当突出并暴露缺陷
B.我们能检查质量
C.质量改进能节约费用,并且提高市场占有率
D.质量就是以客户为导向