A: Would you like something to drink, coffee, tea or orange juice
B: ().

A. No. Don’t go to any trouble!

B. Orange juice would be lovely if you’re having one. Thank you!

C. Thank you. It’s very kind of you to do so.

D. I’m not thirsty. So I don’t want anything to drink.

所谓厂商技术性壁垒是指（）

A.控制关键的投入品

B.独家拥有专用设备

C.有政府给予的产品专卖权

D.拥有极大的市场占有率