银翘散和桑菊饮两方组成中均含有的药物是
A.连翘杏仁桔梗
B.银花杏仁桔梗
C.连翘薄荷芦根
D.银花薄荷芦根
E.杏仁甘草芦根
参考答案：C
_____ they may not succeed, they will try their best.[ ]
A. Though
B. When
C. Because
D. Unless
当通电导体与磁力线之间的夹角为（）时，导体受到的电磁力最大。
A.0°
B.45°
C.60°
D.90°
