— How much are they?
— fifty yuan. [ ]
A. It's
B. That's
C. They're
答案:C
片剂重量差异限度
30g以下片剂
A.4±3.0%B.±5.0%C.±7.5%D.±1O%
如何更全面了解对手实际状况设计战术?