终缩聚釜搅拌器停运后一般应两小时手动地旋转（）。
A、90°
B、180°
C、270°
D、360°
参考答案：B
用于消化道溃疡病散应过（）
A.80～100目筛
B.200目筛
C.120目筛
D.150目筛
E.60目筛
My chief objection to the book is that the characters are stereotyped.
A．lacking in individuality B．incompleteC．poorly drawn D．overdone
