登录
所属栏目：绿色空间
所属频道：CCTV-10科教
年份：2010
展开全部
简介：2006年9月，世界卫生组织宣布解除对DDT的禁令，允许部分地区重新使用这种杀虫剂，曾经，这种杀虫剂曾一度大范围破坏环境，然而禁用DDT，疟疾伤寒等疾病又有卷土重来的趋势……收起
看不见的威胁（五）
看不见的威胁 四
看不见的威胁 三
看不见的威胁 二
看不见的威胁 一
复制成功！
PC客户端下载
移动客户端下载
![[em:1:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/1.gif)
![[em:3:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/3.gif)
![[em:4:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/4.gif)
![[em:5:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/5.gif)
![[em:6:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/6.gif)
![[em:7:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/7.gif)
![[em:8:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/8.gif)
![[em:9:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/9.gif)
![[em:10:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/10.gif)
![[em:11:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/11.gif)
![[em:12:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/12.gif)
![[em:13:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/13.gif)
![[em:14:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/14.gif)
![[em:15:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/15.gif)
![[em:16:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/16.gif)
![[em:17:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/17.gif)
![[em:18:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/18.gif)
![[em:19:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/19.gif)
![[em:20:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/20.gif)
![[em:21:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/21.gif)
![[em:22:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/22.gif)
![[em:23:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/23.gif)
![[em:24:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/24.gif)
![[em:25:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/25.gif)
![[em:26:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/26.gif)
![[em:27:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/27.gif)
![[em:28:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/28.gif)
![[em:29:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/29.gif)
![[em:30:]](http://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1406601454073701/30.gif)
