[FeF6]3-为外轨型配合物。其中心原子的杂化轨道类型和磁矩为： A.
 4s14p34d2；5.75µB B.
3d24s14p3；1.73µB C.
4s14p34d2；1.73µB D.
 3d24s14p3；5.75µB

多项选择题Aboutunified the cart track车同轨, which ones are right understanding? A. It is a policy carried about by Emperor Qin shihuang. B. It means the cart wheel gauge were unified among the nation. C. It means the carts of the whole nation were running on the same track. D. It is also a proverb denoting the country’s unification.

单项选择题铸造圆角的作用是便于起模，防止夹沙，避免产生裂纹和缩孔。 A、正确 B、错误