The news from Shanghai Expo garden yesterday said the main structure of Hubei museum has been_____________. A. completed B. achieved C. constructed D. concluded 答案: A一固体混和物,可能有氯化钙、碳酸铵、烧碱、硫酸铵,将它溶解于水得到无色澄清溶液,无其它明显现象,向溶液中加入硝酸钡溶液,产生白色沉淀,再加入硝酸,沉淀部分消失,原混和物中肯定有
[ ]A、CaCl2和(NH4)2SO4 B、(NH4)2SO4和(NH4)2CO3 C、 NaOH和CaCl2 D、NaOH和(NH4)2SO4