题目内容
已知p：方程x2+mx+1=0有两个不等负实根。q：方程4x2+4（m-2）x+1=0无实根。若p或q为真，p且q为假。求实数m的取值范围。
查看答案
搜索结果不匹配？点我反馈
更多问题
回答下面的题目：Traffic in Uur CitiesTile volume of traffic in many cities in the world today continuesto expand．This causes many problems，including serious air pollution，lengthydelays，and the greater risk__________ (51)accidents．Clearly，something must be done，but it is often difficult to persuade people to__________ (52)theirhabits and leave their cars at home．One possible__________ (53)is to make it more expensive for peopleto use their cars by__________ (54)charges for parking and__________ (55)tougherfines for anyone who__________ (56)the law．In addition，drivers could be required to pay for using particular routes atdifferent times of the day．This system，__________ (57)as“road pricin9”，is alreadybeing introduced in a__________ (58)of cities，using aspecial electronic card__________ (59)to the windscreen of the car．Another way of__________ (60)with the problem is to provide cheapparking on the__________ (61)of the city，and strictly control the number ofvehicles allowed into the centre．Drivers and their passengersthen use a special bus__________ (62)for the final stage of their journey,Ofcourse．the most important__________ (63)is to providegood public transport．However，toget people to__________ (64)the comfort of their cars，publictransport must be felt to be reliable，convenient andcomfortable，with fares__________ (65)at an acceptablelevel．
女性，35岁，温度计制造厂的烘表厂，由于温度掌握不好，温度计破裂，经常有汞蒸气外逸。该工人接触5年后出现了头痛、头昏、记忆力下降，接着出现了易激动，无故烦躁、发怒、爱哭等症状，继而出现眼睑、手指的震颤、口腔粘膜有轻度的溃疡、牙龈酸痛、红肿、有轻微的压痛。实验检查：尿汞（冷原子吸收光谱法）含量0.02mg/L汞进入体内后，其毒作用基础是与（）
胰岛细胞瘤多发生于（）
男性，25岁。反复腹泻2年。粪常规除见少许红、白细胞外无异常，粪细菌培养（-），纤维结肠镜检查见直肠及乙状结肠黏膜充血、水肿，质地脆、易出血。最可能的诊断是（）。
微信支付 
支付宝支付