|a﹣2008|与b2互为相反数，则a+b=（）．

_____with traditional Chinese art made Mr, Seville _____ to come to China for study. [ ]

A. Being obsessed; determined

B. Being obsessed; determining

C. Obsessing; determining

D. Obsessed; determined

介、副词填空。

1. Look ______ the map, please.

2. Please look ______ your things well.

3. Don't worry ______ me.

4. Please give the ruler ______ me.

5. Put this football sock ______. Don't leave it here.

某建设项目总投资50000万元，计划2年完工，建设完成后用于出租，从投资开始到投资全部收回的预期年限为10年。则该项目的预期投资收益率为（）。

A.10%

B.12%

C.12.5%

D.13%

表征聚合物相对分子量的物理量是（）

A、kp

B、kd

C、ν（动力学链长）

D、Xn

对于小尺寸的注射模具型腔的壁厚设计应以满足型腔（）条件为准。