有关门静脉高压症的病理变化特点，错误的是（）。 A.门静脉血流阻力增加是门静脉高压症

用所给动词的适当形式填空。

1. The boy _____ (open) his eyes for a moment, _____ (look) at his mother and then _____ (smile).

2. I _____ (not know) you were in Paris.

3. I_____ (visit) your school before.

4. He _____ (keep) this book for two days.

5. They _____ (know)each other since childhood.

6. _____ Li Ming _____ (study) English this morning?

7. My uncle in London _____ (send) a birthday present to me yesterday.

8. When _____ (be) his sister born?

9. He _____ (live) in his hometown since he left here.

10. He _____ (go) to see his grandfather last Sunday.

（10分）如图所示，在斜面上放着一重为100N的物体，斜面倾角为θ=30°时物体恰能沿斜面匀速下滑,求

（1）物体和斜面间的动摩擦因数？

（2）当斜面倾角为θ=37°时, 让物体沿斜面下滑，在下滑过程中物体受到的摩擦力多大？ （sin37°=0.6  cos37°=0.8）

人的生殖细胞、受精卵、胚胎及个体属于专利法第五条所规定的不能被授予专利权的生物技术发明类型。

捻回角

手少阴心经与手太阳小肠经的交接部位是（）

A.拇指端

B.食指端

C.中指端

D.无名指端

E.小指端