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LED的发光原理及封装分类

1、单选题：
‏LED的发光颜色是由（ ）决定的？‎
选项：
A: 半导体材料的种类 
B: LED两端的电压值
C: 流过LED的电流值
D: LED透镜的颜色
答案: 【 半导体材料的种类 】点我阅读全文

Analyze the following text

1、填空题：
  1 It is a common knowledge that education plays an important role in our lives. The utmost level of education is undoubtedly to have a university degree. However, not every university may   meet your expectations. In order to state that you are a graduate of a good university, there should be some requirements to be met. In my opinion, a good university should have qualified teachers, technologically   adequate buildings and many facilities for students.​      2 First of all, it must have enough qualified teachers for each course. Qualified teachers should   have adequate teaching skills in their subjects. Without adequate teaching skills, it will be difficult for the teacher to transfer his/her knowledge to the students. Also, as a person, the teacher should have proper personalities, that is, a teacher should be kind, supportive and   understanding to his/her students. Otherwise, they may be disliked. So, good teachers are indispensable for a good university.​      3 Secondly, a good university must have many buildings with adequate high technology facilities with students. The classrooms must be large enough and  well–equipped. A small classroom or a classroom without  technological supplies such as the internet or television will certainly demotivate students. In addition, libraries should have enough books and materials for students. This is very important to do research for students' studies or assignments. All these above  considered, technologically developed buildings are necessary for a good  university education.​     4 Finally, a good  university should have many facilities for students. For example, there  must be enough sport centers and cafes for students to spend their time.  Since students spend most of their time studying at school, they need a place  to rest and chat with their friends.​ In addition, students sometimes need to get over their stress spending time in a sport center. Thus, beside academic study, a good university should provide social opportunities to its students.​     5 In conclusion, universities are places where students spend the most important stage of their lives. Universities should support the learning process with qualified teachers, technologically adequate buildings and many social facilities. Students should become familiar with all these characteristics so that they can choose a good university, which will affect their future.​Question:​Identify three parts of the essay: introductory paragraph, body paragraphs and concluding paragraph. ​​​‍​
答案: 【 Introductory paragraph: Paragraph 1.
Body paragraphs: Paragraph 2-4.
Concluding paragraph: Paragraph 5】点我阅读全文

第一章单元测试

1、单选题：
‌税制的构成要素中规定课税标的的要素是（   ）。​
选项：
A: 课税对象
B:  纳税人
C: 税率
D:  课税环节
答案: 【 课税对象】点我阅读全文

小脑幕切迹疝

1、多选题：
‍以下哪些属于小脑幕切迹疝的临床表现‌
选项：
A: 瞳孔先变小后扩大
B: 剧烈头痛和频繁呕吐
C: 生命体征紊乱
D: 枕下疼痛
答案: 【 瞳孔先变小后扩大;
剧烈头痛和频繁呕吐;
生命体征紊乱】点我阅读全文

疾病概论章节测验

1、单选题：
‌下列哪一项可肯定判断脑死亡‌
选项：
A: 昏迷和大脑无反应性
B: 血管造影证明脑血液循环停止
C: 呼吸停止
D: 颅神经反射消失
答案: 【 血管造影证明脑血液循环停止】点我阅读全文

第二讲 单元测验

1、单选题：
​中世纪文学可能分为教会文学与‍      两大类。​
选项：
A: 世俗文学
B: 骑士文学
C: 市民文学
D: 骑士抒情诗
答案: 【 世俗文学】点我阅读全文

第6章测验

1、单选题：
‍​视图主要表达机件的：​ ​‍​
选项：
A: 正面形状     
B: 外部结构   
C: 内部结构 
D: 全部结构
答案: 【 外部结构   】点我阅读全文

单元测试

1、单选题：
‌SART表面应涂____色，以保证具有较高的可见度‏
选项：
A: 红
B: 蓝
C: 桔黄色 
D: 白
答案: 【 桔黄色 】点我阅读全文

一阶常微分方程上的测试

1、单选题：

​微分方程的阶数是（     ）

‍选项：
A: 2
B: 1
C: 4
D: 7
答案: 【 2】点我阅读全文

第1章 单元测试

1、单选题：
‌管理循环的工作程序是​
选项：
A: 计划、执行、处理、检查
B: 处理、计划、执行、检查
C: 计划、执行、检查、处理
D: 检查、处理、计划、执行
答案: 【 计划、执行、检查、处理】点我阅读全文