电力系统中性点直接接地系统的优点是系统的过电压水平和输变电设备所需的绝缘水平较高。
参考答案：错
白虎加人参汤证的病位在（）
A.心、肺
B.肺、胃
C.心、胃
D.肺、肾
E.心、肾
— I've taken someone else's overcoat by mistake. Is it Jack's?
— It ____ be his. He seldom wears white. [ ]
A. can't
B. mustn't
C. won't
D. shouldn't
