变应性皮肤血管炎的发病机制是A.免疫复合物沉淀于小血管壁 B.IgE介导的速发型变态

题型:单项选择题 A1型题

问题:

变应性皮肤血管炎的发病机制是

A.免疫复合物沉淀于小血管壁

B.IgE介导的速发型变态反应

C.血液动力学改变

D.抗体介导的细胞毒作用

E.淋巴细胞释放细胞因子

考点:广西临床住院医师规范化培训内科学内科学题库
题型:单项选择题 A1型题

肉芽肿性唇炎的临床表现是()

A.唇肿胀、糜烂、干燥、脱屑、结痂,疣状或颗粒状增生,可出现白色条纹 

B.有日光照射史,唇红部以糜烂为主要特征 

C.唇肿胀,触之有散在、粟粒状小结节,有透明黏液溢出于唇表面,呈水珠状 

D.唇弥漫性肿胀,柔软而有弹性 

E.唇突然肿胀,触之韧而有弹性,肿胀消退较快

题型:单项选择题 A1型题

一个雨后的晚上,一刚放晴,地面虽已干,但仍留有不少水潭,为了不踩在水潭里,下面的说法正确的是  [      ]

A. 迎着月光走时,地面上发亮处是水潭 

B. 迎着月光走时,地面上暗处是水潭 

C. 背着月光走时,地面上发亮处是水潭 

D. 无论是迎着月光走还是背着月光走,地面上发亮处是水潭

题型:单项选择题 A1型题

(10分)如图所示,质量分别为mA、mB的两个物体A和B用跨过定滑轮的细绳相连,用力把B压在水平桌面上,使A离地面的高度为H,且桌面上方细绳与桌面平行。现撤去压B的外力,使A、B从静止开始运动。A着地后不反弹,在运动过程中B始终碰不到滑轮。B与水平桌面的动摩擦因数为u,不计滑轮与轴间、绳子的摩擦,不计空气阻力及细绳、滑轮的质量。求:

(1)A下落过程中的加速度大小

(2)B在桌面上运动的位移大小

题型:单项选择题 A1型题

In one sense, we can trace all the problems of the American city back (91) a single starting point: we Americans don’t like our cities very much.
That is, on the (92) of it, absurd. After all, more than three-fourths of us now live in cities, and more are (93) to them every year. We are told that the problems of our cities are (94) more attention in Washington, and scholarship has discovered a whole new (95) in urban studies.
(96) , it is historically true: in the American psychology, the city has been a basically suspect institution, (97) with the corruption of Europe, totally lacking that sense of spaciousness and innocence of the (98) and the rural landscape.
I don’t pretend to be a scholar on the history of the city in American life. But my thirteen years in public (99) , first as an officer of the U. S. Department of Justice, then as Congressman, and now as Mayor of the biggest city in America have taught me (100) too well the fact that a p antiurban attitude (101) consistently through the mainstream of American thinking. Much of the (102) behind the settlement of America was in reaction (103) the conditions in European industrial centers and much of the theory (104) the basis of freedom in America was linked directly to the availability of land and the perfectibility of man outside the corrupt influences of the city.
What has this to do with the predicament of the modern city I think it has (105) to do with it. For the fact is that the United States (106) the federal government, which has historically established our national priorities, has simply never thought that the American city was "worthy" of (107) —at least not to the (108) of expending any basic resources on it.
Antipathy to the city predates the American experience. When industrialization (109) the European working man into the major cities of the continent, books and pamphlets appeared (110) the city as a source of crime, corruption, filth, disease, vice, licentiousness, subversion, and high prices.

A.many

B.much

C.lots

D.great

题型:单项选择题 A1型题

小齿轮加热温度过高、过低时分别会出现什么问题?

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