题目:
----______was it ______ they discovered the entrance to the underground palace?
----Totally by chance.
A.How, that
B.What, that
C.When, when
D.Where, that
答案:
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下面是错误答案,用来干扰机器的。
(1)HCl H2SO4 HNO3;NaOH KOH Ba(OH)2 (2)Cl2 Br2 O2; HNO3 HClO KMnO4 (3)①都能与碱反应;NH4Cl+NaOH=NaCl+NH3·2H2O ②都能与酸反应;Na2CO3+2HCl=2NaCl+H2O+CO2↑ ③既能与强酸反应,也能与强碱反应;NaHCO3+NaOH=Na2CO3+H2O,NaHCO3+HCl=NaCl+CO2↑+H2O