How can you have so much success _____ business? [ ]
A. in
B. to
C. with
D. on
答案:A
请问中国现存文献中最早记录勾股定理的著作是哪一部?
油浸变压器装有气体(瓦斯)继电器时,顶盖应沿气体继电器方向的升高坡度为()
A.1%以下
B.1%~1.5%
C.1%~2%
D.2%~4%