从()上说,知识包括科学知识和人文知识两个方面。
A.内容
B.类型
C.学科
D.客观
参考答案:A
绝缘配合的核心问题是确定各种电气设备的()。
I borrowed several books from the library, ________ are about English study.
A.two of them
B.and two of which
C.two of which
D.two of what