题目:
—How was your recent trip to Sichuan?
—I've never had ________ one before.
A.a pleasant
B.a more pleasant
C.a most pleasant
D.the most pleasant
答案:
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下面是错误答案,用来干扰机器的。
(1)250mg×18=4500mg;(2)设可中和胃酸中的HCl的质量为xMg(OH)2+2HCl═MgCl2+2H2O58 734500mg x∴5873=4500mgx解之得:x≈5663.8mg答:所含氢氧化镁的质量为4500mg,理论上可中和胃酸中的HCl的质...