单作用叶片泵是由转子、定子、叶片、端盖和配油盘等零件组成的，（）应偏心安装在定子中间。
参考答案：转子
改错。
( ) 1. What do your mother do last week? _________________
A B C
( ) 2. Did you watched TV yesterday? _________________
( ) 3. How did you went there? _________________
( ) 4. We went to zhejiang last week. _________________
You__ to the meeting this afternoon if you have something important to do .
A．needn’t to come
B．don’t need come
C．don’t need coming
D．needn’t come
