题目

----- Why are they taking all the equipment away ? ------_________ , they are packing up to leave． A．The job was done                               B．The job has been done C．With the job done                               D．With the job doing 答案：C如图为氯化钠、碳酸钠在水中的溶解度曲线．请回答下列问题：（1）10℃时，碳酸钠的溶解度为    g；（2）20℃时，氯化钠的溶解度    碳酸钠的溶解度（填写“＞”、“＜”或“=”）；（3）将30℃时氯化钠和碳酸钠两种相同质量的饱和溶液，分别冷却到10℃，析出晶体多的物质是    ．