()可认为是对规定的规格和性能的满足,当()达到一定的规格和性能时,确认质量合格。
A.质量产品
B.质量服务
C.质量商品或项目
D.质量产品或者服务
参考答案:D
he was ill, he didn't come to school. [ ]
A. Because; /
B. Though; /
C. Though; /
D. Because; /
抗石击隔热阻尼涂料的作用?