问题 问答题 简答题

什么叫机械的维修性?什么叫机械的维修时间?

答案

参考答案:

对于可修产品,在发生故障之后,一般可用维修方法进行修复,这样便可弥补产品可靠性的不足。但维修需要占用一定时间,因而影响了产品的使用。因此,为了充分发挥产品的效能,当其发生故障以后,要求所需的维修时间越短越好。就机械产品而言,它的修复时间与其本身的结构有关,是由设计、制造等因素所决定,是一种固有的属性,它表示机械维修的难易程度,而被称之为机械的维修性。

机械的维修时间是指在机械发生故障后,从寻找故障开始,直至拆卸、修理或更换零件、安装、调试,最后达到完全恢复正常功能为止的全部时间。其平均值可以根据统计公式求出。

单项选择题
单项选择题

With the spread of inter-active electronic media a man alone in his own home will never have been so well placed to fill the inexplicable mental space between cradle and crematorium. So I suspect that books will be pushed more and more into those moments of travel or difficult defecation (1) people still don’t quite know what to do with.

When people do read, I think they’ll want to feel they are reading literature, or (2) something serious. (3) you’re going to find fewer books presenting themselves as no- nonsense and (4) assuming literary pretensions and being packaged as works of art. We can expect an extraordinary variety of genre, but with an underlying (5) of sentiment and vision.

Translators can only (6) from this desire for the presumably sophisticated. We can look forward to lots of difficult names and fantastic stories of foreign parts enthusiastically (7) by the overall worship of the "global village" Much of this will be awful and some wonderful, (8) don’t expect the press or the organizers of prizes to offer you much help in making the appropriate distinctions. They will be chiefly (9) in creating celebrity, the greatest enemy of discrimination, but a good prop for the (10) consumer.

Every ethnic grouping over the world will have to be seen to have a great writer--a phenomenon that will (11) a new kind of provincialism, more chronological than geographic, (12) only the strictly contemporary is talked about and (13) . Universities, including Cambridge, will include (14) their literature syllabus novels written only last year. (15) occasional exhumation for the Nobel, the achievements of ten or only five years ago will be largely forgotten.

In short, you can’t go too far wrong when predicting more of the same. But there is a (16) side to this--the inevitable reaction against it. The practical things I would like to see happen--publishers seeking less to (17) celebrity through extravagant advertising, (18) and magazines (19) space to reflective pieces--are rather more improbable than the Second Coming (耶稣复临). But dullness never quite darkens the whole planet. In their own idiosyncratic fashion a few writers will (20) be looking for new departures.

19()

A.gives

B.giving

C.to give

D.give