—What's this ______Chinese?
—It's "桌子". [ ]
A. at
B. in
C. to
D. of
答案：B
钢中碳含量增加1%，其强度极限提高（）N/mm2
A．20-30
B．30-40
C．40-50
D．60-80
CIPP评估模型
