简述常用管道清蜡的几种方法？
参考答案：
①化学添加剂防蜡与清蜡；
②采用光滑内壁管如塑料管输油或在钢管内壁刷上涂层，以减少结蜡；
③采用清管器清蜡。
阅读理解。
Look at this picture. It's a picture of Jim's bedroom. A broom is behind the door. The football is under
the bed. The chair is behind the desk. Some nice flowers are on the desk. Some nice pictures are on the
wall.
1. This is _____.
A. a picture of Jim
B. a bedroom of a picture
C. a picture of a bedroom
2. Where is the broom?
A. Behind the door.
B. Under the desk.
C. Under the bed.
3. We can see the football _____.
A. near the window
B. behind the chair
C. under the bed
4. Some _____ are on the desk.
A. flowers
B. chairs
C. books
5. You can see _____ on the wall
A. a football
B. a chair
C. some pictures
关于信托的作用机制，以下说法不正确的是（）。
A.信托财产不会受到委托人所受风险的波及，避免债权人对信托财产的追索，保护信托财产不受侵犯，实现风险隔离
B.信托设立后，受托人拥有财产的管理权，他既独立于转移信托财产的委托人，也独立于拥有信托财产收益的受益人，从而实现第三方管理
C.受益人拥有财产却仅能行使管理权，受托人享有收益却无法对信托财产进行处置
D.信托财产的管理权和受益权处于分离状态
wers are on the desk. Some nice pictures are on the