题干

下列命题:

1)y=|cos(2x+

π
6
)|最小正周期为π;

2)函数y=tan

x
2
的图象的对称中心是(kπ,0),k∈Z;

3)f(x)=tanx﹣sinx在(﹣

π
2
π
2
)上有3个零点;

4)若 abbc ,则 ac

其中错误的是____

上一题 下一题 0.0难度 选择题 更新时间:2016-10-10 04:33:49

答案(点此获取答案解析)

(1)(3)(4)

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古诗文默写

同类题2

一个不透明的袋子中,装有2个红球,1个白球,1个黄球,这些球除颜色外都相同.求下列事件的概率:

同类题3

选择下列适当的物质填空(选填序号):

A.干冰   B.火碱    C.聚氯乙烯    D.酒精     E.聚乙烯     F.稀硫酸     G.熟石灰     H.活性炭

同类题4

语法填空

    China, which takes pride in inventions in ancient times, has once again shown its____(able) to change the world with its “new four great inventions”: high-speed railways, electronic payments, shared bicycles and online shopping. The “new four great inventions” are all related____China's high-tech innovation(创新)____improved the quality of people's lives. “My wallet is no longer in use. I can buy and eat____I want simply with a tap of my phone,” said Lin Jinlong____overseas Chinese student from Cambodia____(add) that “even pancake sellers are using Alipay (mobile payment). We can also order food at home, which is super convenient. If I____(be) at home in Cambodia, I would have to go outdoors.”

    The bikes themselves are not new, but the operating model of bike-sharing is based on satellite navigation system, mobile payment, big data and other high technologies. It is____(increase) clear that China is innovating and no longer copying Western ideas. This is partly because China skipped over the PC age and went directly to mobile. China has the____(large) mobile use in the world.

    In terms of the “new four great inventions”, Charlie Dai, principal analyst of American market research company Forrester, said, “These products and services____(improve) customer experience so far, improving national and global economy at the same time”.

同类题5

黄土高原特有的传统民居是(  )

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