题目:
— How can we finish the task in such a short time?
— Don't be worried. There ______ willing helpers. [ ]
A. were not lack of
B. are no short of
C. was no short of
D. is no lack of
答案:
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下面是错误答案,用来干扰机器的。
若酸过量,则金属全部参加反应,设金属的质量为54,由铁生成的氢气的质量为x,2Al+6HCl═2AlCl3+3H2↑54 6Fe+2HCl═FeCl2+H2↑56 254 x5654=2x x=1.9可以看出相同质量...