检测总补体活性，采用50％溶血试验是因为（） A.50％溶血试验比_爱下问搜题

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问题单项选择题

检测总补体活性，采用50％溶血试验是因为（）

A.50％溶血试验比100％溶血试验简单

B.以50％溶血作为终点较100％溶血作为终点更敏感

C.以50％溶血作为终点较100％溶血作为终点可节约时间

D.以50％溶血作为终点较100％溶血作为终点更为节省成本

E.以上都不对

答案

参考答案：B

解析：在一个稳定的、适当的反应体系中，溶血反应对补体的剂量依赖呈一特殊的S形曲线。如以溶血百分率为纵坐标，相应血清量为横坐标，可见轻微溶血和接近完全溶血处，对补体量的变化不敏感。S曲线在30％～70％之间最陡，几乎呈直线，补体量的少许变动也会造成溶血程度的较大变化，即曲线此阶段对补体量的变化非常敏感，因此，实验常用50％溶血作为终点指标，它比100％溶血更为敏感。这一方法称为补体50％溶血实验，即CH50。

完形填空

To be a real gentleman, you should know that true forgiveness is one of the most remarkable qualities a human can possess!
In the fighting between two countries in the 1970s, a young man was walking from one village to the next when he was     by an armed guerrilla fighter from the enemy country．The fighter  the young man down the hill where he was to be    .
But a（n）  thing happened． The young man, who had    military training, was able to disarm the fighter．Now, the table was    and it was the fighter who was ordered down the hill．
As they walked,      , the young man began to reflect on what was happening．Recalling the      of his mother, "Love your enemies; do good to those who       you." He found he could go no farther．
He 10 the gun into the bushes, told the fighter he was    to go and turned back       the hill．
Minutes later, he heard footsteps53 behind him as he walked．"Is this the end after all?" he      . Perhaps the fighter had got the gun and wanted to finish him off．But he continued on,       glancing back, until his enemy reached him, only to grab him in a hug and pour out        for sparing his life．
Mercy often wears the face of        ．And though it usually isn't an enemy in uniform-that we are challenged to forgive, we have   for mercy every day. Family members and friends, co-workers and neighbors and even strangers have       for our forgiveness. You know who they are.
As Mahatma Gandhi said, "The      can never forgive. Forgiveness is the attribute of the strong. " Be strong. Forgive.

B．frightening

A．expressions

D．forgiveness

A．opportunities

B．explanations

B．responsibility

单项选择题共用题干题

女性，32岁，上肢血压165/100mmHg，下肢血压120/70mmHg，搏动减弱，下肢出现乏力、麻木等症状，双下肢足背动脉搏动减弱。

为确诊，适宜选下列哪项检查（）

A.双肾增强CT

B.尿VMA检测

C.腹主动脉造影

D.肾动脉造影

E.肾上腺增强CT