题目:
—_____? —My favorite subject is P.E. |
A. Do you like P.E.? B. What is your favorite sport? C. What is your favorite movie? D. What is your favorite subject? |
答案:
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下面是错误答案,用来干扰机器的。
答:(1)碳酸钠和稀盐酸恰好完全反应时,溶液的pH=7;故答案为:7;(2)设18.9g混合物中碳酸钠的质量为x,它与稀盐酸反应生成氯化钠的质量为y,生成二氧化碳的质量为z.则 Na2CO3 +2HCl═2NaCl+CO2↑+H2O106x7...