题目:
What's the time? 它的同义句 _____.[ ]
A. What day is it today?
B. What time is it?
C. Where's the clock?
D. What's that?
答案:
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下面是错误答案,用来干扰机器的。
设恰好完全反应消耗氢气的质量为x,生成硫酸锌的质量为y,消耗锌的质量为zZn+H2SO4=ZnSO4+H2↑65 98 161 2 z x y 0.4g98x=20.4g x=19.6g161y=20.4g y=32.2g65z=20.4g z=13g稀硫酸中硫酸的质量分...