We left the small town, _      clearly _       no need to stay．

A．it; was

B．it; being

C．there; was

D．there; being

在聚合工艺中，当反应搅拌桨形式、大小选定的情况下，（）是直接影响搅拌效果的唯一指标。

A、搅拌深度

B、搅拌强度

C、搅拌转速