该孕妇此时易发生的并发症是A．胎儿畸形 B．胎盘早剥 C．妊高征 D．流产 E．死胎

0，0，6，24，60，120 ( )

A．180

B．196

C．210

D．216

用括号内所给单词的适当形式填空

1. I_______ (drop) the cup on the floor by accident.

2. They are _______ (possible) tired after working so long.

3. He tried many times and ________(final) he succeeded.

4. Fred is afraid of _______(fly).  He feels anxious before he gets on the plane.

5. The bicycle must be ________(Carla).

常用的硬度指标有布氏硬度、洛氏硬度两种。布氏硬度常用的表示方式有HRA、HRB、HRC三种。（）

干法挤出过程与湿法挤出过程有哪些差别？

陶瓷被用作人工股骨头材料是因为

A．价格低

B．耐蚀性好

C．耐磨性好

D．生物相溶性好

E．耐疲劳性好