— Sam hasn't come yet.

— He likes to watch football match, ______? So I'm sure he'll come. [ ]

A. doesn't he

B. does he

C. isn't he

D. is he

装配中常用的定位方法有（）。

A、划线定位和坐标定位

B、划线定位和样板定位

C、基准定位和基础定位

D、测量定位和样板定位