离槽
参考答案：槽筒上负责将纱线自导纱中点导向筒子边端的槽，称离槽。
They are __ the old houses in order to set up a new teaching building.
A．tearing down
B．tearing up
C．putting up
D．putting down
何首乌花的特征是（）
A.花被外侧3片背部有翅
B.花被5裂
C.花被6裂
D.花被外侧3片背部无翅
E.花白色
