淋证的主要病机是____，____，病位在肾与膀胱。
参考答案：湿热蕴结下焦；肾与膀胱气化不利
用所给词的适当形式填空。
1. Mr. Dean ________ (drive) his new car on the street.
2. Many students enjoy ________(listen) to the music after school.
3. Most of us don't agree with ________(he).
4. Let's ________(drink) some orange juice.
5. There ________ ( not be) any water in the bowl.
下列关于χ2分布的特点描述，正确的有
A．χ2取值均为正值
B．χ2分布是正偏态分布
C．χ2分布为非连续性分布
D．χ2分布的标准差与自由度相同
