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变压器电压切换装置各分接头与线圈的连线应紧固正确，各分接头应清洁且接触紧密良好。转动点应正确停留在各个位置上，并与指示器所指位置一致。( )
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TEXT D In the 1960s, medical researchers Thomas Holmes and Richard Rahe developed a check- list of stressful events. They appreciated the tricky point that any major change can be stressful. Negative events like "serious illness of a family member" were high on the list, but so were some positive life-changing events, like marriage. When you take the HolmesRahe test you must remember that the score does not reflect how you deal with stress—it only shows how much you have to deal with. And we now know that the way you handle these events dramatically affects your chances of staying healthy. By the early 1970s, hundreds of similar studies had followed Holmes and Rahe. And millions of Americans who work and live under stress worried over the reports. Somehow, the research got boiled down to a memorable message. Women’s magazines ran headlines like "Stress causes illness!" "If you want to stay physically and mentally healthy," the articles said, "avoid stressful events." But such simplistic advice is impossible to follow. Even if stressful events are dangerous many—like the death of a loved one—are impossible to avoid. Moreover, any warning to avoid all stressful events is a prescription for staying away from opportunities as well as trouble. Since any change can be stressful, a person who wanted to be completely free of stress would never marry, have a child, take a new job or move. The notion that all stress makes you sick also ignores a lot of what we know about people. It assumes we’re all vulnerable and passive in the face of adversity. But what about human initiative and creativity Many come through periods of stress with more physical and mental vigor than they had before. We also know that a long time without change or challenge can lead to boredom, and physical and mental strain. According to the passage people who have experienced ups and downs may become ______.
某项目有甲、乙两个建设方案，基准收益率ic＝10%，两方案的净现值等有关指标如下表所示。已知(P/A，10%，6)=4.355、(P/A，10%，10)=6.145，则两方案可采用( )。 方案 寿命期(年) 净现值(万元) 内部收益率(%) 甲 6 100 14.2% 乙 10 130 13.2%
简答题 某低压配电室内，成排配电柜的前后通道间距过小、出口位置不合理、采暖系统采用丝扣连接、配电室上层是多水场所等，影响配电系统的正常运行，给维修带来不便，造成不安全的隐患。 为防止上述现象发生，应采取哪些防护措施
三相变压器的基本原理和单相变压器的原理是不一样的。( )
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