ISO9000族标准中的位置，它是计算机软件机构实施（）的标准 A．ISO9000

根据《建筑工程建筑面积计算规范》(GB/T50353)，关于室外楼梯的建筑面计算的说法，正确的是（）。

A.有永久性顶盖的按自然层水平投影面积计算 

B.无永久性顶盖的按自然层水平投影面积的1/2计算 

C.顶层无永久性顶盖的室外楼梯各层均不计算建筑面积 

D.无永久性顶盖的上层不计算建筑面积

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.

19（）

下列概念中，由神经元细胞体构成是（______），由神经纤维构成是（______）．

A．灰质B．白质C．神经D．神经节E．神经中枢F．大脑皮层．

CD4E变速箱2/4制动带的作用是什么？（）

A.固定前太阳轮

B.固定前齿圈

C.固定倒档离合器毂

D.固定后太阳轮

在下列经济行为中，属于货币执行价值尺度职能的是（）

A.2.5千克苹果价格10元钱

B.用10元钱购买了2.5千克苹果

C.购买2.5千克苹果，一周后付款10元钱

D.先付款10元钱，预订2.5千克苹果