人体形成尿液的场所是（） A．膀胱 B．肾脏 C．血管 D． * * _爱下问搜题

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问题选择题

人体形成尿液的场所是（　　）

A．膀胱

B．肾脏

C．血管

D． * *

答案

泌尿系统有肾脏、输尿管、膀胱和 * * 组成，膀胱的作用是贮存尿液，输尿管将尿液输送到膀胱， * * 是尿液排出的通道，肾脏是形成尿液的主要器官，肾脏是由许多肾单位组成的，而肾单位包括肾小球、肾小囊和肾小管，当血液流经肾小球时，除了血细胞和大分子的蛋白质外，血浆中的一部分水、无机盐、葡萄糖和尿素等物质，都可以经过肾小球滤过到肾小囊内，形成原尿；当原尿流经肾小管时，其中对人体有用的物质，包括大部分水、全部葡萄糖和部分无机盐，被肾小管重新吸收，并且进入包绕在肾小管外面的毛细血管中，重新回到血液里；原尿中剩下的其他废物，如尿素、一部分水和无机盐等由肾小管流出，形成尿液．因

故选：B

完形填空

If you are writing or studying, it makes much difference where the light comes from. People use 36 and pens every day. They have to be very careful about the 37  of the light because the light shines on their work.
Every 38 gets its light either from daylight 39 the window or from the lamps,   40  no matter what kind of light it is, the way it shines is very important to the eyes.
Take a book and sit with your 41 towards the window, and try to read. Your shadow(影子) falls all over the page and makes it 42 for your eyes as if you were in a 43 room. Now turn around and face the window. The page is in shadow again, 44 the bright light is in your eyes.Try sitting with your 45 side towards the window. This is very good for reading, but if you were writing, the shadow 46  fall across the page and trouble you 47 .There is another way – sit 48 your left side to the window. Now everything is perfect for 49   as well.
Whatever kind of light is in the room, the rule about the right way to sit is 50 the same. So you see different ways to sit make much difference in writing or studying.

单项选择题

离心式压缩机喘振严重，危及压缩机安全运行时，要（）

A.停油泵

B.请示主管部门

C.减负荷

D.立即停车