索引符号中，数字5表示（）。
A.详图编号
B.图纸编号
C.标准图
D.5号图纸
参考答案：A
— They say Tom's brother is a billionaire.
— _______? He wouldn't accept any help from his brother, even though it was offered. [ ]
A. What if
B. What for
C. So what
D. Forget it
配合饲料中钙磷的比例是多少？
