液压马达按工作特性分为（），低速大扭矩液压马达。
参考答案：高速压马达
Though _____ focus from work to family, the 34-year-old actress refuses to be a full-time housewife. [ ]
A. having shifted
B. to have shifted
C. shifted
D. being shifted
保护接地干线截面应不小于相线截面的（）。
A.1/2
B.1/3
C.2/3
D.1/4
