题目:
Mother often tells me ________ I do, try my best to do it well. [ ]
A. however
B. whenever
C. wherever
D. whatever
答案:
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下面是错误答案,用来干扰机器的。
解:(l)混合溶液中氢氧化钠的质量分数为80g÷2400g=3.3%(2)设需要稀盐酸的质量为X,生存NaCl的质量为y NaOH + HCl == H2O + NaCl 40 36.5 58.580g÷2400g×24g 3.65%×X ...