When do I need to use an apostrophe?什么时候用撇号?Answer these questions, using the words in parentheses. Put the apostrophe in the right place.用句后括号中的词或词组来回答问题, 注意撇号的位置.'It's' (with an apostrophe) should be use...
目的: 从佩兰中提取挥发油,并测定其含量.Objective : To extract and determine naphtha in Eupatorium fortune.方法: 采取超临界CO2萃取 、 微波萃取和水蒸汽蒸馏三种方法提取佩兰挥发油.Method: The volatile oils were obtained with supercritical CO 2, microwave and stream distill...
Their absoluteness mainly refers to infiniteness and invariability while relativity denotes finiteness and variability.其绝对性主要是指它们的无限性和不变性,其相对性主要是指它们的有限性和可变性....