拖拉机的履带是由若干块金属板连接而成的,每块金属板上都有一两条突起的棱,金属板的

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问题:

拖拉机的履带是由若干块金属板连接而成的,每块金属板上都有一两条突起的棱,金属板的作用是                      突起的棱的作用是                                     。

考点:增大和减少压强的办法
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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.

5()

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SOLAS公约规定,辅助操舵装置应在船舶最深航海吃水和以最大营运航速的一半或7节前进时,在不超过()内将舵自一舷15°转至另一舷15°。

A.30s

B.45s

C.60s

D.65s

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俗话说“文如其人”,用现代时髦的说法就是一位作家的人品在很大程度上影响着其作品的()。

A:品质

B:品格

C:气质

D:风格

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散发性甲低()

A.身材矮小,智力落后 

B.身材矮小,体形匀称 

C.身材矮小,鸡胸,脊柱侧弯 

D.身材矮小,月经早现 

E.身材矮小, * * 过早发育

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车架的检测可用小锤敲击听其声响,若声音清脆,则说明零件()。

A.已产生裂纹或结合处松动

B.弯曲、扭曲

C.无裂纹、结合处无松动

D.锈蚀

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