The main bone of contention is the temperature level of the air-conditioners.争来争去无非是空调温度。During hot weather, the city's electrical system is often overloaded by fans and air conditioners.天气炎热时, 这座城市的电力系统常常因电风扇和空调器的使...
纤维素是带有好多羟基的不幼链环型布局的聚合物.Cellulose is a very polyhydroxylated of long - chain - type structure of the polymer.使用的催化剂对醇 羟基 的氧化具有高度的选择性并有很高的转化率.These reactions catalyzing oxidation of alcohol - OH groups have high yield and ...