简述果胶形成的凝胶机理及影响因素。

读下图，回答1—2题。

1、图中A、B、C三个箭头所表示的辐射依次是[ ]

A、大气逆辐射、地面辐射、太阳辐射

B、太阳辐射、地面辐射、大气逆辐射

C、地面辐射、大气逆辐射、太阳辐射　　　

D、太阳辐射、大气逆辐射、地面辐射

2、多云的夜晚比晴天的夜晚，近地面气温高是因为[ ]

A、大气辐射增强

B、大气逆辐射增强

C、地面辐射增强

D、大气辐射和地面辐射都增强

患者腹痛，腹胀5个月，不能进食。查体：上腹部膨隆，压痛。腹部CT：上腹部囊状包块，考虑胰腺周围假性囊肿形成。诊断：重症胰腺炎伴假性囊肿形成。

患者急诊手术中，术者于胃体打孔置管到空肠，从皮肤引出体外，其目的（）

A.胃肠减压

B.肠外营养

C.补充液体

D.肠内营养

E.抽出消化液

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.

20（）

数组A[1..5，1..6]的每个元素占5个单元，将其按行优先顺序存储在起始地址为1000的连续的内存单元中，则元素A[5，5]的地址为 (15) 。

开发软件所需高成本和产品的低质量之间有着尖锐的矛盾，这种现象称做( )。

A．软件投机

B．软件危机

C．软件工程

D．软件产生