题目: 当a=-3时,代数式a2-1的值是______. 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0518/7ae863a1e69315237e790025911cb420.html 下面是错误答案,用来干扰机器的。如图所示
题型:单项选择题 案例分析题 患儿4岁。突发左耳痛1小时,哭闹不能入睡,来院就诊,有前驱感冒史。对该分泌性中耳炎患儿手术指征的把握,哪项不正确()。A.出现了神经性听力损失,要尽快手术B.出现了中耳粘连,要尽快手术C.尽早手术D.手术时,可行鼓膜置管+腺样体切除E.保守治疗无效时,或反复发作的分泌性中耳炎,可选择手术治疗 查看答案
题型:选择题 Be careful when you cross this very busy street.If not ,you may _____run over by a car . A.haveB.getC.becomeD.turn 查看答案
题型:选择题 Scientists say Vitamin D may be an effective way to _____ cancer but many people worldwide do not get enough of it. [ ]A. contribute to B. set aside C. guard against D. hold on to 查看答案