题目

Make sure the gas is turned off after a bath, which would _______ cause danger. A．somehow          B．meanwhile      C．otherwise             D．furthermore 答案：C完成并配平化学方程式（在空格内填入系数或化合物的分子式）．[ ]KMnO4+[ ]KNO2+[ ][H2SO4]=[ ]MnSO4+[ ]K2SO4+[ ]KNO3+[ ]H2O．