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为什么给水泵采用平衡鼓？
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在做变压器油中溶解气体色谱分析试验时，若发现乙炔的含量超过（）时，就应引起注意。
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观察白喉棒状杆菌异染颗粒，宜选用的最佳培养基是（）
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表皮上构成气孔的保卫细胞一般具有以下特点（）。
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胺基化合成过程中，若属原料系统故障，需要紧急停车，要按（）顺序停车。
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佛教在中国的发展，提出对佛经译文质量的较高要求。其中中国取经人的代表是（）
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The Greek philosopher Aristotle said that a persons highest happiness comes from the use of his or her intelligence. Religious books such as the Koran and Bible discuss faith as a form. of happiness. The British scientist Charles Darwin believed that all species were formed in a way so as to enjoy happiness. And, the United States declaration of independence guarantees "life, liberty and the pursuit of happiness as a basic human right". People throughout history may have had different ideas about happiness. But today, many people are still not very sure about it. Some findings are not surprising. For example, the database suggests that married people are happier than single people. People who like to be with other people are happier than unsocial people. People with children are equally happy as couples without children. And wealthier people are only a little happier than poorer people. This database also shows that studying happiness no longer involves just theories and ideas. Economists, psychiatrists, doctors and social scientists are finding ways of understanding happiness by examining real sets of information. Happiness is an extremely popular subject, if you search for "happiness" on the web site of the online bookseller, Amazon. com, you will find more than two hundred thousand results. Dan Gilbert teaches psychology at Harvard University in Massachusetts. He recently looks at the way the human mind is different from other animals because we can think about the future and use our imaginations. He also explains how our minds can trick us in a way that creates difficulties in making happy choices for the future. "Most of the time when people are wrong about how theyll feel about the future, theyre wrong in the direction of thinking that things will matter to them more than they really do. We are remarkable at our ability to adjust and a-dapt to almost any situation but we seem not to know this about ourselves. And so we mistakenly predict that good things will make us happy, really happy for a really long time. Bad things, why theyll just slay us. It turns out neither of these things is on the whole true. "The first paragraph in the passage is mainly talking about______.A．the importance of happinessB．the cause of happinessC．the meaning of happinessD．people who are happy
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机械伤害是指由于机械性（）的作用而造成的事故。
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干气密封的任何结构改造、控制系统及控制方案以及控制参数的改变、密封气和备用密封气及隔离气工艺参数的改变，必须经（）人员、（）及（）审批。
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下述哪项不是急性牙髓炎的临床表现（）。