【单选题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
给出以下命题: (1)若 ∫ ba f(x)dx>0 ,则f(x)>0; (2) ∫ 2π0 |sinx|dx=4 ; (3)应用微积分基本定理,有 ∫ 21 1 x dx=F(2)-F(1) ,则F(x)=lnx; (4)f(x)的原函数为F(x),且F(x)是以T为周期的函数,则 ∫ a0 f(x)dx= ∫ a+TT f(x)dx ; 其中正确命题的个数为( )
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
手机使用
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/share-ico-3febd.png)
分享
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/link-f6c98.png)
复制链接
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/weibo-3e538.png)
新浪微博
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/qq-1c308.png)
分享QQ
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/wechat-a78ae.png)
微信扫一扫
微信内点击右上角“…”即可分享
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/report-ico-11843.png)
反馈
![收藏 - 刷刷题](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/coll-ico-cfcc9.png)
收藏
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/jubao-9c477.png)
举报
参考答案:
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
参考解析:
![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)