急性附睾炎最常见致病菌为（）
A.葡萄球菌
B.大肠埃希菌
C.变形杆菌
D.肠球菌
E.绿脓杆菌
参考答案：B
The poor ______ living in the mountain ____ top is covered with green trees.
A．are; which
B． are; of which
C．is; whose
D．are; whose
漏电保护器的工作零线可重复接地。( )
