尿石症形成的主要因素有（）。 A.尿路感染 B.长期饮水不足 C._爱下问搜题

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问题单项选择题 A1型题

尿石症形成的主要因素有（）。

A.尿路感染

B.长期饮水不足

C.尿液pH变化

D.饲料营养不均衡

E.以上都是

答案

参考答案：E

解析：尿石症指尿路中的无机盐类（或有机类）结晶的凝结物，刺激尿路黏膜而引起出血、炎症和阻塞的一种泌尿器官疾病。尿石症形成的因素主要有尿路细菌（如葡萄球菌、变形杆菌等）感染；维生素A缺乏；长期饮水不足，尿液浓缩；尿液pH的变化；饲料营养不均衡；甲状旁腺机能亢进等。因此，尿石症形成的主要因素包括上述所有选项

单项选择题

A beautiful young woman stopped a taxi in a big square and said to the driver, "Do you see that young man at the other side of the square" "Yes," said the driver. The young man was standing outside a restaurant and looking at his watch every few seconds. "Take me over there," said the young woman. There were a lot of cars, buses and trucks in the square, so the taxi driver asked, "Are you afraid to cross the street" "Oh, no." said the young woman. "But I said I would meet that young man for lunch at one o’clock, and it is now a quarter to two. If I arrive in a taxi, it will at least seem that I have tried not to be too late.\

How did the young woman get to the square
A. She walked there.
B. She arrived there in a taxi.
C. The story doesn’t tell.

填空题

一般来说，行车中驾驶员（）左右的有效信息是靠视觉获得的，所以视觉特性对安全行车有重大影响。