巡视人员离10kV故障接地点的距离，室内不得小于（）m。
A、1
B、2
C、4
D、8
参考答案：C
I have been living in the United States for 20 years, but seldom ______ so lonely as now.
A．have I felt
B．I had felt
C．I have felt
D．had I felt
对放疗最敏感的卵巢肿瘤是 （）
A.无性细胞瘤
B.内胚窦瘤
C.颗粒细胞瘤
D.卵泡膜细胞瘤
E.纤维瘤
