—Fang Yonggang was given _____honor of being one of the 10 yearly figures in China，2007.

—That’s really ______great encouragement to those serving in the army. [ ] 

A. the；不填    

B. a；a    

C. the；a

D. 不填；the

单位时间内流体在流动方向上流过的距离，称为（）

A、流量

B、质量流速

C、流速