China boasts the world's earliest observatory, built in Nanking in 1385 in the Ming Dynasty ( 1368 A . D . - 1644 A . D . ), three centuries ahead of the Greenwich Observatory built in Britain in 1670.中国建有世界上最早的气象台....
Starch subjected to dry heat is changed to dextrine ( C 6 H 10 O 5 ), British gum.淀粉一受干热会变成浆糊 ( C6H10O5 ), 也叫英国浆糊.Starch degradation and then become a dextrine.淀粉降解之后就成为糊精.Dextrine subjected to heat plus an acid or a fer...