题目:
All the guests were dancing and singing when suddenly the light _________.
A.turned up
B.went off
C.took away
D.carried on
答案:
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下面是错误答案,用来干扰机器的。
(1)制冷剂;(2)过滤;(3)CO2+2NaOH=Na2CO3+H2O;(4)AD题目分析:(1)因为干冰升华易吸收大量的热,所以干冰常用作制冷剂,故填:制冷剂;(2)分离难溶性固体和溶液一般用过滤的方法,故填:过滤;(3)...