【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。
【单选题】What is the difference between horizontal e-marketplaces and vertical e-marketplaces?
A.
Vertical e-marketplaces support commerce between multiple industries; horizontal e-marketplaces support commerce between businesses from the same industries
B.
Vertical e-marketplaces support commerce between businesses from the same industry; horizontal e-marketplaces support commerce between businesses from different industries
C.
Horizontal e-marketplaces support commerce between businesses and consumers; vertical e-marketplaces support commerce between business and business
D.
Horizontal e-marketplaces support commerce between business and business; vertical e-marketplaces support commerce between consumer and business
【简答题】标注尺寸的 称为尺寸基准,机器零件在 三个方向上,每个方向至少有一个尺寸基准
【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?