皮皮学，免费搜题
登录
搜题
【简答题】
给出下列四个命题： ①函数f（x）=lnx-2+x在区间（1，e）上存在零点； ②若f'（x 0 ）=0，则函数y=f（x）在x=x 0 取得极值； ③m≥-1，则函数 y=lo g 1 2 ( x 2 -2x-m) 的值域为R； ④“a=1”是“函数 f(x)= a- e x 1+a e x 在定义域上是奇函数”的充分不必要条件． 其中真命题是 ______（把你认为正确的命题序号都填在横线上）
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】听力原文： Thirty-four patients died and two were injured early yesterday when a fire broke out in a psychiatric hospital in the town of Nonsan. A police spokesman told reporters there were 41 patients in ...
A.
the day before yesterday
B.
at two o'clock yesterday morning
C.
around 2: 00 p.m. yesterday
D.
at twenty past five yesterday morning
【单选题】Advertisement: For sinus pain, three out of four hospitals give their patients Novex. So when you want the most effective painkiller for sinus pain, Novex is the one to choose. Which of the following,...
A.
Some competing brands of painkillers are intended to reduce other kinds of pain in addition to sinus pain.
B.
Many hospitals that do not usually use Novex will do so for those patients who cannot tolerate the drug the hospitals usually use.
C.
Many drug manufacturers increase sales of their products to hospitals by selling these products to the hospitals at the lowest price the manufacturers can afford.
D.
Unlike some competing brands of painkillers, Novex is available from pharmacies without a doctor' s prescription.
E.
In clinical trials Novex has been found more effective than competing brands of painkillers that have been on the market longer than Novex.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
