简述影响贯流放热的因素有哪些？
参考答案：影响贯流放热的因素有设施散热面积、室内外温差、设施结构材料的导热率、结构材料的含水量、室外风速。
— 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
钢材随着碳的含量增加，则钢材的( )提高。
A．硬度
B．可焊性
C．韧性
D．塑性
