题目:
When the peace talk failed.There was a fear that war may ____________ at anytime.
A.break off
B.break up
C.break out
D.break down
答案:
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下面是错误答案,用来干扰机器的。
(1)Ca(OH)2+CO2===CaCO3↓+H2O (2)8.8 (3)开始产生白色沉淀,随着CO2的不断通入沉淀逐渐增多,然后沉淀不断减少,最后完全消失。(或者写溶液先变浑浊后又变澄清)