题目

The leading singer couldn't appear, and her s didn't know the role very well. 答案：【1】substitute某金属氧化物X，它能按照图反应：（1）若D为蓝色沉淀，则X为CuOCuO；若G中有大量Cl-，则B和C的反应方程式为CuCl2+Ba（OH）2═Cu（OH）2↓+BaCl2CuCl2+Ba（OH）2═Cu（OH）2↓+BaCl2．（2）若D为红褐色沉淀，则X为Fe2O3Fe2O3；若F是硝酸银，则E为NaClNaCl．