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近几年来，许多在高楼大厦里工作的白领常常会莫名其妙地出现类似头疼、鼻塞、眼睛干涩发痒以及疲乏无力这样的症状。时间一长，人们将这种现象称为“病楼综合征”。于是，许多无端的责怪都冲向办公大楼，似乎是这些高楼大厦本身给楼内工作人员的健康带来了灾难。然而，英国科学家最近发表的一项研究报告显示，办公大楼本身并不是这种综合征的病源。人们在工作中所面临的日益增长的压力才是真正的元凶。 在这项研究中，研究人员调查了四千多名在办公大楼里工作的英国政府雇员的健康状况。这些公务员分布在伦敦44个办公大楼里工作。研究人员对其工作环境及所受的工作压力进行了分析。研究还分析了大楼里的有关环境指标，如温度、湿度、粉尘、空气中的真菌和细菌含量等。研究人员发现，虽然工作环境中的燥热和湿度情况，以及空气中的粉尘和细菌对楼内工作人员的健康有一些影响，但是真正具有明显统计意义的结果却是，这些政府雇员所面临的工作压力，以及常常所处的无助状态导致了这些人产生“病楼综合征”，而工作地点本身与这种综合征并无实质性的关联。 研究人员表示，“病楼综合征”的说法实际上是一种误导。这种综合征症状的存在，以及因此造成的许多工作人员经常请假，所带来的经济损失是相当大的。但是具体的工作环境并不是产生这些综合征的根源。 研究人员表示，像“病楼综合征”这样的情况，需要从心理和社会环境的综合角度去分析。总的来讲，人们所面对的工作压力是造成这种综合征的主要根源，而工作环境状况差则起到了推波助澜的作用。 |
All friendships require a certain amount of chemistry. But when two people of the opposite sex become friends, sometimes those friendly feelings can start to resemble something more like sexual tension.
Male-female friendships can be an emotional minefield of hidden desires. Does this mean you secretly want to jump into bed with all of your friends Of course not. But do you ever wonder how many of them might be interested if the opportunity presented itself Maybe you and your platonic (柏拉图式的) friendship are just a bad breakup and a bottle of wine away from crossing that boundary and hooking up(结合).
So can two people of the opposite sex ever really be "just friends" The Hollywood answer to this age-old question is a decisive HELL NO. On screen, male-female friendships always turn into something more. Harry and Sally, Chandler and Monica, Jim and Pam ... do I need to go on Even the characters in Just Friends wind up becoming much more than the film’s
A. has been proved true
B. has been practiced a lot
C. doesn’t work
D. is abandoned by people
Their recovery in an Oracle Database?
If a row lock is held by a nonexistent transaction, the block containing the row
Is media corrupt.
DB_BLOCK_CHECKING=TRUE causes a check sum to be added to each data
Block to help detect physical or media corruption.
A media corrupt block is one where the block is not formatted correctly.
The ANALYZE TABLE VALIDATE STRUCTURE CASCADE command verifies that
Each table row has an index entry pointing to it.
Life on land probably began about 430 million years ago, though it has existed in the water for perhaps as long as 3, 000 mil lion years. When we think of the first life on land, we probably think of strange animals coming out of the oceans, but, in fact, no animals could have been living if plants had not been on land first. Plants had to be on land before animals arrived. They supplied the first land animals with food necessary to live, since they are the only form of life that is able to get and store energy.
The first plants to exist out of the water were probably certain kinds of algae(海藻) which were followed by other plants that grew close to the ground near water and needed water in which to repro duce. Once the move to land had been made, however, evolution (进化) took place quickly. By the end of 100 million years, plants had developed their roots, and some developed tall tree like forms, since height was very important in competing for sunlight. About 300 m
A. they do not have branches
B. they do not have flowers
C. they do not have seeds
D. they do not need sunlight
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