搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

关于肠梗阻影像学表现，下列错误的是（）

A.扩张的肠袢靠拢形成咖啡豆状，为急性机械性小肠梗阻的典型表现

B.绞窄性小肠梗阻时，肠袢由于嵌顿并充满血性液体而呈软组织团块影，形成"假肿瘤"征

C.麻痹性肠梗阻的特点是大小肠呈均等积气、扩张，可有气-液平面

D.麻痹性肠梗阻扩张的肠管相互靠近，肠间隙常增宽

E.急性结肠梗阻时闭袢性扭转的特点是：结肠明显扩张，可达10~20cm，扩张的乙状结肠呈马蹄状，内有两个较宽的液面，其扩张的顶部可达中上腹部

答案

参考答案：D

解析：麻痹性肠梗阻时扩张的肠管相互靠近，但一般肠间隙正常，如肠间隙增宽，常提示腹腔内有感染。

单项选择题

It is clear that some chemicals can damage the health of animals and humans. (1) , this is not the only problem that (2) be caused by the careless use of chemicals. Chemicals can also (3) the ecological balance of the environment. If the ecological balance is disturbed, the results can be (4) serious.The (5) of DDT illustrates the problem. DDT, a chemical which kills insects, at first seemed to be a perfect answer (6) many problems. It would control insects that caused dangerous diseases, (7) insects that caused billions of dollars of damage to crops every year. Governments permitted and even (8) the use of DDT. Farmers in many countries (9) to spray it on their crops. The (10) results were good. Damage to crops (11) down, and profits went up. However, the chemical had effects which the scientists didn’t see in (12) . First, it also killed insects which were the (13) enemies of the harmful insects and which were therefore beneficial to farmers. Second, and perhaps worse, DDT did not kill (14) harmful insect. A few insects had natural resistance to the chemical. They (15) and reproduced in large numbers. In a few years there were large numbers of insects which were not (16) by DDT, and there were (17) insects which Could act as natural (18) on these new "super-insects". Finally, it became clear that DDT was not solving the insect problem. In fact, it was making the problem worse. It (19) became necessary to find a second (20) for the effects of the first.

第（4）空应选择（）

A．little

B．much

C．extremely

D．hardly
查看答案
单项选择题

保护规划成果一般由规划文本、规划图纸和附件三部分组成，有关这三部分的说明有误的一项是( )。

A．文本要表达规划意图、目标和对规划有关内容提出的规定性要求；文本表达应当规范、准确、肯定、含义清楚

B．文本一般包括以下内容：城市历史文化价值概述，历史文化名城保护原则和保护工作重点；规划实施管理措施等

C．图纸用图像表述现状和规划内容，比例尺为1:15000～1:10000

D．附件包括规划说明书和基础资料汇编，规划说明书的内容是分析现状、论证规划意图、解释规划文本等
查看答案