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问题 多项选择题

正常人的血液在血管内不发生凝固的原因有（）

A.血液流动快

B.血管内膜光滑完整

C.纤维蛋白溶解系统的作用

D.有抗凝血物质存在

E.以上都不对

答案

参考答案：A, B, C, D

计算题

解下列方程：

（1）x2-6x-2=0；

（2）x2-6x+9=（5-2x）2。
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选择题

Not only _______interested in Beijing Opera but ______beginning to show an interest in it.

A．the father himself is; all his children are

B．the father himself is; are all his children

C．is the father himself; are all his children

D．is the father himself; all his children are
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