动态风险在一定条件下具有一定的规律性，变化比较规则，可以通过大数法则加以测算。

与思维破裂关系最密切的疾病是（）。

A.精神发育迟滞

B.癔症

C.精神分裂症

D.躁狂症

E.偏执性精神病

生物体的遗传物信息主要存在于[ ]

A．细胞膜

B．细胞质

C．细胞核　

D．线粒体

在下列各句的空白处填入一个最恰当的单词

1. He becomes sad easily. Let's __________ him up.

2. I often help mum __________ the dishes on the table before meals.

3. If you are good at playing soccer, you can help __________ a soccer team for kids.

4. There are many traffic __________ along the street. They can help you find the museum.

5. He likes animals very much.  He wants to be a __________ in the future.

齿厚与槽宽只有在直齿圆柱齿轮的分度圆上其大小才相等。

气硬性凝胶材料主要有（）

A.砂子

B.石灰

C.水泥

D.石膏

E.水玻璃