枳实导滞丸中的清热药有（）
A.连翘
B.黄连
C.银花
D.黄柏
E.栀子
参考答案：B
将发动机输入的机械能转换为液体的压力能的液压元件是（）。
A.液压泵
B.液压马达
C.液压缸
D.控制阀
Although he knew little about the large amount of work done in the field, he succeeded ________ other more well - informed experimenters failed.
A．which
B．that
C．what
D．where
