邮政企业，是指中国邮政集团公司及其提供邮政服务的全资企业、控股企业。
参考答案：对
The Canadian friends from our school have given us a lot of books, few of ________ a bit difficult for us Chinese students.
A. them are
B. that is
C. which are
D. which is
利用活动扳手扳动大螺母时，手应握在接近（）处。
A.头部
B.柄尾
C.扳手中间
D.自己习惯
