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影响生态平衡的因素有植被破坏、__________和食物链被破坏等。
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第1空:[ "参考解析: 生物种类的减少" ]
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认为群落并非自然界的实体,而是生态学家为了便于研究,从一个连续变化着的植被连续体中,人为确定的一组物种的集合,这种群落性质观点是 。
生物群落对其周围环境产生重大影响,并形成__________。
演替的趋向一般是从低等生物逐渐发展到高等生物。( )
生态系统中生物有机体在能量代谢过程中,将能量、物质重新组合,形成新的生物产品(糖类、脂质和蛋白质等)的过程,称为生态系统的
按人类对生态系统的影响,生态系统可分为自然生态系统和__________。
在植物种群中,在高密度的样方中,有些植株死亡了,于是种群开始出现__________。
简述生态平衡的概念与标志。
饶基耶尔划分生活型的最重要依据是 。
很多鸟类迁徙和开始生殖的时间取决于______变化。
_________以多年生草本植物占优势,辽阔无林,在原始状态下常有各种善于奔驰或营穴洞生活的草食动物栖居其上。
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60. 对职工的生活水平状况进行分组研究,正确地选择分组标志应当用( )。(1分)
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把电阻R和电容C串联,再并联到电源开关两端所构成的RC吸收电路,其作用为()(2010年第9题)
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21.Video recorders and photocopiers, even ticket machines on the railways, often seem unnecessarily difficult to use. Last December I bought myself a Video cassette recorder (VCR) described as “simple to use”. In the first three weeks I failed repeatedly to program the machine to record from the TV, and after months of practice I still made mistakes. I am not alone. According to a survey last year by Ferguson, the British manufacturer, more than one in four VCR owners never use the timer on their machines to record a programme: they don’t use it because they’ve found it far too hard to operate.So why do manufacturers keep on designing and producing VCRS that are awkward to use if the problems are so obvious?First, the problems we notice are not obvious to technically minded designers with years of experience and trained to understand how appliances work. Secondly, designers tend to add one or two features at a time to each model, whereas you or I face all a machine’s features at once. Thirdly, although find problems in a finished product is easily, it is too late by then to do anything about the design. Finally, if manufacturers can get away with selling products that are difficult to use it, it is not worth the effort of any one of them to make improvements.Some manufacturers say they concentrate on providing a wide range of features rather than on making the machines easy to use. But that gives rise to the question, “why can’t you have features that are easy to use?” The answer is you can.Good design practice is a mixture of specific procedures and general principles. For a start, designers should build an original model of the machine and try it out on typical members of the public-not on colleagues in the development laboratory. Simple pubic trials would quickly reveal many design mistakes. In an ideal world, there would be some ways of controlling quality such as that the VCR must be redesigned repeatedly until, say, 90 percent of users can work 90 per cent of the features correctly 90 per cent of the time.(10分)21.1 The author had trouble operating his VCR because ________.(2分)A. he had neglected the importance of using the timerB. the machine had far more technical features than necessaryC. he had set about using it without proper trainingD. its operation was far more difficult than the designer intended it to be
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不安抗辩权的效力是指先履行一方当事人有权( ) 。
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