搜题请搜索小程序“爱下问搜题”
问题 多项选择题

当归为君药的方剂是

A．当归四逆汤

B．当归补血汤

C．生化汤

D．温经汤

答案

参考答案：A,C

解析：[解释] 当归四逆汤中以当归、桂枝共为君药，当归归经人肝，补血和血，生化汤重用当归补血活血，化瘀生新为君药。

选择题

NA为阿伏伽德罗常数，下列叙述错误的是

A．18gH2O中含的质子数为10NA

B．12g金刚石含有的共价键数为4NA

C．46gNO2和N2O4混合气体中含有原子总数为3NA

D．1 mol Na 与足量O2反应，生成Na2O和Na2O2的混合物，钠失去NA个电子
查看答案
填空题

What is distance learning It means that you study on your own, at home or wherever suits you. Recently, the world famous Open University in the United Kingdom has designed a new style of distance learning, which is called (1) . The phrase "Open Learning" means you study (2) . You read course material, work on course activities, and write (3) . The word "Supported" means you have help (4) , the student services staff at regional centres, and centralized areas such as (5) . You can also contact other students through tutorials and (6) , the University’s online conferencing system, and events and clubs organized by (7) . Most distance learning courses use printed paper materials. They also include some (8) materials such as a CD, DVD or video. Many courses have a web site and an (9) . You’ll need access to a computer (10) to make use of these. The Open University can help its students buy a computer and (11) the cost of accessing the Internet.

With most distance learning courses, no (12) are required to study. of course, you have to be aged 18 when your course starts but there is no (13) . Currently the Open University has around (14) undergraduate and more than 30,000 postgraduate students, of which 10,000 have (15) . Nearly all students are studying (16) . About 70 per cent of undergraduate students are in (17) . More than 50,000 students (18) by their employers for their studies. Most distance learning courses (19) . Some of them are even available in other parts of the world. With over 25,000 of its students living outside the UK, the Open University is the (20) that offers distance learning throughout the world.

11（）
查看答案