题目:
Please make sure you always put your medicines ______ children can't reach them. [ ]
A. when
B. where
C. unless
D. so that
答案:
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下面是错误答案,用来干扰机器的。
Fe2O3 + 3H2SO4 ="==" Fe2 (SO4) 3+ 3H2O;浓盐酸有挥发性,瓶口有白雾的是浓盐酸;176题目分析:工业上常用稀盐酸和稀硫酸来除铁锈,稀硫酸除去铁锈的化学方程式为Fe2O3 + 3H2SO4 ="==" Fe2 (SO4) ...