抗体初次应答的特点是A.抗体以IgG类为主 B.抗体亲和力较高 C.抗体浓度达到平台

题型:单项选择题

问题:

抗体初次应答的特点是

A.抗体以IgG类为主

B.抗体亲和力较高

C.抗体浓度达到平台期所需时间较短

D.抗体生成"倍增时间"较长

E.抗体产生潜伏期较短

考点:临床执业医师医学免疫学免疫应答
题型:单项选择题

阅读下列材料,回答下列问题.

厄瓜多尔的首都基多,坐落在赤道附近的高山山谷中,平均海拔2850米,人口达140万,是世界上年温差最小的地点之一,素有“永春城”之称.

月份123456789101112
气温

C)

12.612.512.512.512.612.612.512.612.712.612.512.6
降水

(mm)

10610913218812739223876939697
利马是秘鲁的首都,坐落在西部滨海的热带沙漠中,人口达600多万,气候温和,降水极少,有世界“无雨城”之称.

月份123456789101112
气温

C)

21.722.421.920.217.816.115.015.015.616.117.619.4
降水

(mm)

10.40.50.314675210.8
(1)根据基多和利马的气候资料,试判断两地的气候类型:

基多是______气候,描述气候特征______;

利马是______气候,描述气候特征______.

(2)气候的两个要素包括______和______.

题型:单项选择题

The crowd at the airport moved forward like waves. The passengers had been waiting for a couple of hours for an airline employee to open the door leading to the plane outside. No one was in a good mood. An old man got trapped in the middle of the rush. Suddenly, he fell down, his head hitting the concrete floor, with blood gushing from his forehead. He appeared to be unconscious. Everyone rushed past him, except for Dana. She called for help.

A minute later, a young airline employee showed up. Hardly looking at the old man, she told Dana to get aboard her plane. She said the old man would be okay, and walked away.

Dana screamed for help. An airport supervisor appeared. He told Dana to get on the plane. Dana said that she was not moving until an ambulance arrived. The supervisor said her plane would leave without her. Dana said that she didn’t care.

An ambulance and two doctors finally arrived. The paramedics said that the man would be okay, but he would need stitches(缝线). They put him into the ambulance and drove off.

On her way out to the plane, which was still refueling, Dana saw the employee who had ignored the old man. The employee said, “You’re lucky the plane didn’t leave without you.”

“The plane?” Dana asked. “Who cares about the plane? How could you be so cold? That was an old man; he could have been your grandfather! How would you like it if everyone just stepped over your grandfather and went on their way?”

【写作内容】

1、以约30词概括上文的主要内容;

2、以约120词谈谈你阅读了该故事后的感受,内容包括:

(1) 当时在场的人是怎样的一种心理?

(2) 如果你当时也在场,你将如何处理?

(3) 你对整个事件作如何评价?

【写作要求】

1、在作文中可以使用自己亲身的经历或虚构的故事,也可以参照阅读材料的内容,但不得直接引用原文中的句子;

2、作文中不能出现真实姓名和学校名称。

题型:单项选择题

男性,40岁,体健,吸烟:40支/日。临床诊断为慢性牙周炎,经牙周系统治疗及局部药物治疗后效果不理想,口腔卫生状况尚可。应最先考虑影响其疗效的因素是()

A.营养因素

B.咬合关系

C.吸烟

D.使用的药物不当

E.工作紧张

题型:单项选择题

标准几何体创建命令Box(盒子)可用来创建长方体,按下键盘(ctrl)键后再拖动鼠标,即可创建出().

A、四面体

B、梯形

C、正方形

D、正方体

题型:单项选择题

玫瑰护肤液的作用和制作?

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