搜题请搜索小程序“爱下问搜题”
问题 单项选择题

一患者右上中切牙和侧切牙唇面各有一块1mm大小白垩色斑，边界尚清楚，经李大夫检查和询问病史后诊断为（）。

A．很轻度氟牙症

B．非氟性斑

C．脱矿性斑

D．色素附着

E．正常牙

答案

参考答案：B

单项选择题

Slavery Divides the Nation
Conflicting interests in north and south became increasingly apparent. Resenting the large profits obtained by northern businessmen from marketing the cotton crop, southerners attributed the backwardness of their section to northern expansion. Northerners, on the other hand, declared that slavery--the "peculiar institution" the south felt to be essential to its economy-- was wholly responsible for the region’s relative backwardness.

The main contradiction between the north and the south was that ______.
A. northerners thought they didn’t make large profits from cotton
B. northerners thought slavery was the cause of the backwardness in the south
C. southerners thought the north made the south poor
D. the north and the south had different interests

As far back as 1830s, sectional lines had been steadily hardening on the slavery question. In the north, abolitionist feeling grew more and more powerful, encouraged by a free-soil movement vigorously opposed to the extension of slavery into the regions not yet organized as states. To southerners of 1850, slavery was a condition for which they were no more responsible than for their English speech or their representative institutions. In some coastal areas, slavery by 1850 was well over 200 years old, an integral part of the basic economy of the region. In 15 southern and border states, the black population was approximately half as large as the white, while in the north it was an insignificant fraction.
From the middle 1840s, the slavery issue became more important than all else in American politics. The south, from the Atlantic to the Mississippi River and beyond, was a relatively compact political unit agreeing on all fundamental policies affecting cotton culture, using only primitive implements, was singularly adapted to the employment of slaves. It provided work nine months of the year and permitted the use of women and children as well as men.
查看答案
单项选择题 A1型题

颅内压的调节和代偿主要通过以下哪个方面（）

A.脑血容量，颅内血液被排挤到颅外血液循环

B.脑血管收缩，减少脑血流量

C.脑组织被压缩使脑体积缩小

D.脑脊液分泌减少或颅内脑脊液被挤到脊髓蛛网膜下腔

E.脑组织移位
查看答案