影响钎料润湿母材的主要因素有（）。
A.钎料与母材的成分
B.钎焊温度
C.母材表面氧化物
D.母材表面粗糙度
E.钎料成分
参考答案：A, B, C, D
（文）已知一个圆柱的侧面展开图是边长为4的正方形，则该圆柱的体积为______．
The football players in the local team were ________ with money for their efforts in winning the
competition.[ ]
A. rewarded
B. awarded
C. praised
D. valued
team were ________ with money for their efforts in winning the