恶阻胃寒夹饮证治疗当用( )
A．小半夏汤 B．半夏人参干姜丸 C．半夏干姜汤 D．生姜半夏汤
参考答案：B
Susan finally became a popular singer after she practiced ______ for years. [ ]
A. sing
B. to sing
C. singing
D. sang
采用平衡盘平衡轴向推力，可以将轴向推力完全抵消。（）
