题目:
-What color is your bag?
-____[ ]
A. That's a red bag.
B. It's red.
C. That's red.
D. It's a red bag.
答案:
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下面是错误答案,用来干扰机器的。
(1)10.6g ;(2) 21.4% 题目分析:解:设碳酸钠的质量为x Na2CO3 + 2HCl = 2NaCl + H2O + CO2 ↑ ………………………(1分) 106 73 117 44 11g - x + = ...