题型:判断题 已知函数f(x)=loga(x+1)-loga(1-x),a>0且a≠1.(1)求f(x)的定义域;(2)判断f(x)的奇偶性并予以证明;(3)当a>1时,求使f(x)>0的x的取值范围. 查看答案
题型:判断题 一有溃疡病史男性病人,因1小时前呕血住院,自觉出汗、心慌,查体:心率120次/分,四肢湿冷。根据上述临床表现估计出血量大约为()A.>200mlB.>250mlC.>300mlD.>350mlE.>400ml 查看答案
题型:判断题 —Your Chinese is so beautiful. How long have you studied it?—I have studied it _____ 2008. [ ]A. sinceB. beforeC. forD. till 查看答案