打叶工序喂料机均料辊的作用是（）。
A.均匀物料
B.均衡产量
C.松散物料
D.A和C均是
参考答案：D
12．It was in this very village ______ he was born and brought up.
A．where
B．there
C．when
D．That
旅游的基本要素是旅游者、旅游资源、旅游业。
