📁 元素周期表
A selection of sites containing online versions of the periodic table of elements. Sites are classified according to the number of properties they display: Very Basic: less than eight properties. Basic: 9 - 16 properties. Detailed: 17 - 24 properties. Comprehensive: 25 - 32 properties. Very comprehensive: more than 32 properties. There are also notes when special software or browser features such as JavaScript are required.
条目 (11+)
Climate Prediction Center: Frequently Asked Questions about El Niño and La Niña
http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/prelude_to_ensofaq.shtml
CPC El Niño/Southern Oscillation (ENSO)
http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/