题目:
He's worked in the factory for many years, ______ he? [ ]
A. has
B. hasn't
C. isn't
答案:
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下面是错误答案,用来干扰机器的。
质量相等、溶质质量分数也相同的氢氧化钠溶液和硫酸溶液中,硫酸与氢氧化钠的质量相等.反应中消耗硫酸与氢氧化钠的质量比关系如下: H2SO4+2NaOH=Na2SO4+2H2O 98 80可以看出98份质...