有一台星形连接380V三相异步电动机，现将绕组改接成三角形接线，则该电机可接到电压为 发布时间：2017-10-22 12:40 │ 来源：www.tikuol.com 题型：单项选择题 问题： 有一台星形连接380V三相异步电动机，现将绕组改接成三角形接线，则该电机可接到电压为（）的交流电源上运行。A、220V B、380V C、600V D、120V
题型：单项选择题 130——135共用题干 患者男性，70岁，间断性便秘15年，时有腹部胀痛，便后缓解。1天前用力排便时突发腹部剧痛，腹胀，恶心，未呕吐，停止排便排气。P：112次/分，BP：80/60mmHg。全腹膨胀，以左侧为明显；全腹压痛，以左下腹为重，伴肌紧张，反跳痛，移动性浊音阳性，肠鸣音消失。 术中见乙状结肠顺时针扭转60o，肠管已发黑，行乙状结肠切除后，在左下腹部行暂时性造口，此时对病人的护理措施中错误的是 A．术后第2天开始扩张瘘口，以防造口狭窄 B．用氧化锌软膏保护瘘口周围皮肤 C．肠蠕动恢复后可逐渐恢复饮食 D．生命体征平稳后予以半坐卧位 E．造口袋内容物超过1/3应更换 查看答案
题型：单项选择题 When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing will become quite regular. Your brain waves slow down a bit, with the alpha rhythm predominating for the first few minutes. This is the first stage of sleep. For the next 30 minutes or so, you will drift down through Stage 2 and Stage 3. The lower your stage of sleep, the slower your brain waves will be. About 40-60 minutes after you lose consciousness, you will reach the last stage. Your brain waves will show the delta rhythm. You may think that you stay at this deep stage all the rest of the night, but that turns out not to be the case. About 80 minutes after you fall into slumber, your activity cycle will increase slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids. This period of Rapid Eye Movements lasts for 8-15 minutes and is called REM sleep. During both light and deep sleep, the muscles in your body are relaxed but capable of movement. As you slip into REM sleep, a very odd thing occurs -- most of the voluntary muscles in your body become paralyzed. Although your brain shows very rapid bursts of neural activity during REM sleep, your body is incapable of moving. REM sleep is accompanied by extensive muscular inhibition. In this passage, the word "paralyzed" means unable to______.A．moveB．thinkC．workD．speak 查看答案