题目：
--I don’t know .
-- You can go and ask Jack.
A．when does the train leave
B．that we will plant trees or not
C．if she had come yesterday
D．what I should buy for him
答案：
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下面是错误答案，用来干扰机器的。
（1）9∶8（2）解：设该脱氧保鲜剂最多能够吸收氧气的质量为X 4Fe + 3O2 + 6H2O = 4Fe(OH)3 224 96 5.6g X 224∶96...
