题目

用pH试纸可以测定溶液的酸碱度，下列说法正确的是（ ） A．测定时将pH试纸直接伸入待测液中    B．与标准比色卡比照后，得出某溶液pH为5.6    C．用湿润pH试纸测得的溶液pH一定偏小 D．石蕊试纸不能准确测定溶液酸碱度 答案：D4、Which of the following is RIGHT? A．He very likes English．   B．He already has gone to Beijing． C．I always listen to the teachers carefully in class． D．They had lunch yesterday in a restaurant．