To find out the decay character of residual chlorine (RC) in the sea water, the concentration of RC was analyzed by N, N-diethyl-p-phenylenediamine (DPD) method
经常有学生跟笔者反映语法难学,不知怎么学。我的回答是,语法其实很简单,只是我们经常在使用而不知道而已。我写了以下一篇小短文,反复修改后,基本涵盖了英语的所有语法,包括所有词性的类型,句子的类型,句子的结构,从句的类型,时态的类型,以及其它特殊的句型等。从内容来看,比较简单,也有一定的激励性,很适合中学生朗读和背诵。 ①My name is Li Hua. ②I used to dislike E
An attenuation depth is defined for remote sensing purposes as a depth above which 90% of the arising light leaving the water surface is originated. The deeper
Diatom Skeletonema costatum Cleve is one of the main predominant phytoplankton species in the Changjiang Estuary in China. In order to provide some basic inform