黑色格板用来测定涂料的()
A.颜色;
B.固体分;
C.遮盖力;
参考答案:C
I had to buy _____ these books because I didn't know which one was the best. [ ]
A. both
B. none
C. neither
D. all
按可追溯性要求,货物状态卡不设置( )状态标志。
A.待处理
B.不合格
C.待检
D.已处理