A.锋电位 D.阈电位 C.负后电位 D.局部电位 E.正后电位腹股沟疝数

题型:单项选择题

问题:

A.锋电位 D.阈电位
C.负后电位 D.局部电位
E.正后电位

腹股沟疝数月,反复脱出,平卧即消失,诊断为

考点:普通考研西医综合西医综合
题型:单项选择题

男性,65岁。20年前诊断为右心衰竭,15年前诊断为肝硬化。下列哪项不可能出现()。

A.肝脏增大

B.肝脏缩小

C.AFP增高

D.下腔静脉增宽

E.肝静脉增宽

题型:单项选择题

再生齿

题型:单项选择题

Green Gene Technology For the past 10,000 years humans have influenced the plants they use at first unknowingly, later by design. Today’s crops have been created by a process of selection and classical breeding. More specific improvements in breeding will be possible in future. Science has cracked the genetic information code. Green gene technology is an effective tool in crop breeding, enabling us to develop new crops even more rapidly and specifically. We can make them more efficient, optimizing their contents and valuable substances to suit the wishes and requirements of customers and the processing industry. Their metabolism can be individually modified, making them produce starch, protein and fats with special properties. Through gene transfer plants can be made more resistant to viruses, bacteria, harmful fungi and insect pests. Genetically modified plants can be cultivated to possess improved stress behavior, with the result that they absorb water better in dry locations and can make more efficient use of soil nutrients. We can also optimize weed control. To do so, we make crops tolerant to environmentally sound and easily degradable herbicides. This is not as simple as it sounds. But we have been successful: Innovator has been on the Canadian market since 1995. This is the first oilseed rape variety to contain the glufosinate tolerance gene, facilitating the use of AgrEvo’s broad-spectrurn herbicide liberty. We are committed to green gene technology, with which we aim to make crop breeding even more efficient and environmentally friendly. Before being brought on to the market these genetically modified plants are researched and tested for years until the questions posed regarding their safety have been answered. This is a great opportunity for us to realize our vision: the use of faster methods to breed varieties which will continue to provide us with sufficient food and raw materials in future. Our fossil reserves will soon be exhausted. Experts estimate that we only have enough oil for another 43 years and natural gas for less than 60. This means we must rethink and act accordingly, using new crop varieties to step up the move to replenishable sources of raw materials and energy. In other words, green gene technology is the key technology for sustainable agriculture.

题型:单项选择题

女73岁,牙列缺失,戴用全口义齿2周后,自觉上唇处疼痛,左侧咬食物时义齿不脱位,右侧咬食物时义齿脱落,有时会咬伤颊部软组织,查见上唇系带处有一个直径约2mm的溃疡

当右侧咬食物时义齿脱落,应该选磨右侧

A.上后牙颊尖或下后牙舌尖

B.上后牙舌尖或下后牙颊尖

C.上后牙颊尖或下后牙颊尖

D.上后牙舌尖或下后牙舌尖

E.上下后牙中央窝

题型:单项选择题

按()分类,一般催化剂可分为过渡金属催化剂、金属氧化物催化剂、硫化物催化剂、固体酸催化剂等。

A、催化反应类型

B、催化材料的成分

C、催化剂的组成

D、催化反应相态

更多题库