Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present
A、whollyoperationalC
暂无解析
Blue－green algae grow abundantly in salt marshes.
Cream of tartar 酒石 , a weak acid, can be added to egg whites to help them foam泡沫 when they are beaten
Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
Whencarbonisaddedtoironintheproperproportions,theresultissteel.
One of the greatest breakthroughs for professional women came in 1973 when the field of banking opened up for them.
