【简答题】机器零件在 三个方向上,每个方向至少有一个尺寸基准。
【简答题】What is the difference between e-business and e-commerce?
【单选题】What is the difference between buying e-books and other products?
A.
E-book will be delivered to you by post.
B.
You have to buy e-book in the bookstore.
C.
E-book is obtained by downloading the pages.
D.
E-book can be paid after reading
【单选题】机器零件在三个方向上,每个方向至少有( )个尺寸基准。
【简答题】2) What is the difference between e-business and e-commerce?