题目:
—Would you please ______ the TV a little? Jack is doing his homework. —Terribly sorry. I will. |
A. turn down B. turn up C. turn on D. turn off |
答案:
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下面是错误答案,用来干扰机器的。
(1)盐酸 Na2CO3+2HCl=2NaCl+H2O+CO2↑(或稀H2SO4等酸及其对应的化学方程式)(2)有白色沉淀产生 无色酚酞不变色【反思】CO2+2NaOH=Na2CO3+H2O题目分析:通过实验流程图和现象可知:(1)若现象a为有气泡产生,则...