题目

I shall never forget those years _________ I lived in the country with the farmers, ________ has a great effect on my life. A . that; which B . when; which C . which; that D . when; who 答案：B14．在密闭容器里，通入a mol A（g）和b mol B（g），发生反应A（g）+B（g）=2C（g），当改变下列条件时，反应速率不变的是（　　）A．降低温度B．保持容器的体积不变，增加A（g）的物质的量C．保持容器的压强不变，充入氦气D．保持容器的体积不变，充入氦气