有一个灯泡,它的电阻是15Ω,把灯泡两端加6V电压时,灯泡能正常工作。如果把灯泡 发布时间:2017-04-15 20:28 │ 来源:www.tikuol.com 题型:计算题 问题: 有一个灯泡,它的电阻是15Ω,把灯泡两端加6V电压时,灯泡能正常工作。如果把灯泡接在7.5V的电源上,仍使灯泡正常发光,应给灯泡串联一个多大的电阻?
题型:计算题 Two groups of people are compared in the third study. They are people().A.with less than5 hours of sleep a night and with 7 to 9 hours of sleepB.who slept 4 hours a night and who slept 4 hours for 2 nightsC.with less than 4 hours of sleep a night and with 7 to 9 hours of sleepD.with less than 5 hours of sleep a night and with 8 hours of sleep 查看答案
题型:计算题 患者,女性,26岁,经常感到头晕,面色苍白,检查血常规,示小细胞低色素性贫血血红蛋白91g/L,初诊为缺铁性贫血,可测定哪个血清蛋白等指标以明确诊断()A.TRFB.AAGC.AATD.HDE.AMG 查看答案