A:工期优化
B:技术优化
C:成本优化
D:质量优化
750+1473=____
1548÷43=____
June ____ (twelve) is his birthday.
开动脑筋给下列句子排序。
A. I like juice. B. Hello, Danny. C. Here you are. D. Thank you. E. Hello, Alice. What do you like?
____