渣浆泵填料每圈填料要将接口交错（）。
A、45°
B、90°
C、120°
D、180°
参考答案：D
— When can I come for the photos? I need them tomorrow afternoon.
— They ____ be ready by 12:00. [ ]
A. can
B. should
C. might
D. need
简述附则涵盖的内容。
