搜题请搜索小程序“爱下问搜题”
问题 单项选择题

能够通过胎盘引起新生儿溶血病的抗体类型是（）

A.IgA

B.IgM

C.IgG

D.IgD

E.IgE

答案

参考答案：C

解析：新生儿溶血病(HDN)主要原因为母婴血型不合，孕母体内IgG类血型抗体通过胎盘进入胎儿体内，作用于胎儿红细胞，引起新生儿溶血病。另外也可根据IgG及IgM的特性进行判断，IgG分子量较小16万，IgM分子量较大100万，IgG单体易通过胎盘是新生儿溶血病的主要抗体。

综合

2010年10月26日8时30分，三峡工程首次达到175米正常蓄水位，这标志着三峡工程由初期运行期转入正常运行期。长江三峡地区，河谷深且岩层软硬相间，断裂构造发育。现在我们所看到库区的高低水位区间的岸坡，除了宽厚的堆积阶地以外，都是基岩裸露或碎石堆积，这是百年出现一次的洪水(水位涨落约30米)侵蚀的结果；但三峡水库形成后，水库水位每年涨落30多米，这意味着库水对两岸的侵蚀强度比自然洪水对两岸的侵蚀强度增强100倍。

长江三峡枢纽工程正常蓄水后，分析对库区周围山体滑坡灾害的发生所产生的影响。
查看答案
单项选择题

Not everyone in the world requires the same amount of living space. The amount of space a person needs around him is a cultural difference, not an economic one. Knowing your own psychological space needs is important because they ply affect your choices, including, for example, the number of bedrooms in the home. If you were brought up in a two child family and both you and your sister or brother had your own bedrooms, the chances are if you have two children or more, that you also will offer separate bedrooms for them. In America, for example, they train people to want to have their own rooms by giving them their own rooms when they are babies. This is very unusual in the world. In many other countries, the baby sleeps in the same bed with his parents or in bed near them.
The space in the home also shows a lot about psychological space needs. Some families gather closer to each other and the size of their house has nothing to do with it. Others have separate little corners where family members go to be alone.
Although it is true that psychological space needs are not decided by economic reasons, they sometimes have to be changed a little because of economic pressure. It is almost impossible, however, to completely change your psychological space needs.

According to the writer of the passage, psychological space needs ______.

A．are not affected by income at all
B．can hardly be changed altogether
C．can be changed if you make up your mind to do so
D．have nothing to do with cultural background
查看答案