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设离心机转鼓直径为1m，转速n=600 1/min，则在其中沉降的同一微粒，比在重力沉降器内沉降的速度快____________倍。
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降尘室的生产能力仅与其沉降面积和粒子的沉降速度有关，而与降尘室的高度无关。（ ）
用一降尘室来净制含有煤粉的空气，煤粉粒子的最小直径为10mm，密度为1400kg*m3，气体温度为25℃，在此温度下的粘度为0.018m*N*s*m-2，密度为1.2kg*m，含尘气体接近常压，处理量为2m3*s-1。气体进入降尘室内保持流速为0.2m*s-1。若降尘室的宽为2.5m，长为5m，试估算降尘室的总高度，层数及每层的高度？
Have you ever been afraid to talk back when you are treated __1__ ? Have you ever brought something just because the salesman talked you into it? Are you afraid to ask someone for a date?Many people are afraid to assert themselves. Dr. Alberti thinks it's because their self-respect is low. "Our whole __2__ is designed to make people distrust themselves," says Alberti. "There is always __3__ around --a paretn, a teacher, a boss--- who knows better. These superiors often gain when they chip away at your self-image."But Alberti and other scientists are doing something to help people __4__ themselves. They __5__ "assertiveness training" courses at for short. In the AT courses people learn that they have a right to be themselves. They learn to speak to speak out and feel good about doing so. They learn to be more __6__ without hurting other people.In one way, learning to speak out is to __7__ fear. A group taking to a course will help the timid person to lose his fear. But AT uses an even stronger __8__ ---the need to share. The timid person speaks out in the group because he wants to tell how he feels.Whether or not you speak up for yourself depends on your self-image. If someone you face is more "important" than you, you may feel less of a person. You start to __9__ your own good sense.You go by the other person's __10__. But, why should you? AT says you can get to feel good about yourself. And once you do, you can learn to speak out.A. doubtB. activeC. systemD. offerE. unfairlyF. unfortunatelyG. motiveH. imageI. peaceJ.demandK. askL.superiorM.overcomeN.confidenceO. roar
引起口腔真菌感染的主要原因是
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