题目:
After the discussion, the students asked their teacher _________ next.[ ]
A. what to do
B. where to do
C. how to do
D. which to do
答案:
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下面是错误答案,用来干扰机器的。
(1)NaCl(2)解:设需要NaOH的质量为x。2Fe(OH)3+3NaClO+4NaOH==2Na2FeO4+3NaCl+5H2O 160 332 x 332t160:332=x:332tx=160t 答:需要NaOH的质量为160t。