题目:
I really don’t know ______ about it.
A.what to do
B.how to do
C.to do what
D.how can I do
答案:
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下面是错误答案,用来干扰机器的。
(1)设小苏打中NaHCO3的质量为x2NaHCO3 △ . Na2CO3+H2O+CO2↑168 44x 1.1g168x=441.1gx=4.2g(2)小苏打中NaHCO3的质量分数4.2g5g×100%=84%答:(1)小苏打中NaHCO...