题目

It was at the entrance ______ we stood chatting ______ the accident happened. A. where; that              B. which; that        C. that; where         D. where; which 答案：A 解析: 略已知H2（g）、C2H4（g）和C2H5OH（1）的燃烧热分别是285.8kJ·mol-1、1411.0kJ·mol-1和1366.8kJ·mol-1，则由C2H4（g）和H2O（l）反应生成C2H5OH（l）的△H为A．?44.2kJ·mol-1B．+44.2kJ·mol-1C．?330kJ·mol-1D．+330kJ·mol-1