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建筑工程施工安全技术 焊、割构件和焊、割场所可采取的防火防爆措施中不包括______。
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建筑工程施工安全技术 下列关于特殊场所使用的照明器具应使用的安全电压不正确的是______。
矿山安全技术 局部通风机的通风方式中，______指局部通风机安装在距离掘进巷道口10m以外的回风侧，新鲜风流沿巷道流入，污风通过风筒由局部通风机抽出。
建筑工程施工安全技术 竹笆脚手板应按其主筋垂直于纵向水平杆方向铺设，且采用______，4个角应用直径1.2mm的镀锌钢丝固定在纵向水平杆上。
Psychologist George Spilich and colleagues at Washington College in Chestertown, Maryland, decided to find out whether, as many smokers say, smoking helps them to "think and concentrate". Spilich put young non-smokers, active smokers and smokers deprived(被剥夺) of cigarettes through a series of tests. In the first test, each subject(试验对象)sat before a computer screen and pressed a key as soon as he or she recognized a target letter among a grouping of 96. In this simple test, smokers, deprived smokers and nonsmokers performed equally well The next test was more complex, requiring all to scan sequences of 20 identical letters and respond the instant one of the letters transformed into a different one. Non-smokers were faster, but under the stimulation of nicotine(尼古丁), active smokers were faster than deprived smokers. In the third test of short-term memory, non-smokers made the fewest errors, but deprived smokers committed fewer errors than active smokers. The fourth test required people to read a passage, then answer questions about it. Non-smokers remembered 19 percent more of the most important information than active smokers, and deprived smokers bested those who had smoked a cigarette just before testing. Active smokers tended not only to have poorer memories but also had trouble separating important information from insignificant details. "As our tests became more complex", sums up Spilich, "non-smokers performed better than smokers by wider and wider margins". He predicts, "Smokers might perform adequately at many jobs until they got complicated. A smoking airline pilot could fly adequately if no problems arose, but if something went wrong, smoking might damage his mental capacity". We can infer from the Last paragraph that ______.
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