题目:
—Have you heard from Jim?
—No, I haven't. The underlined part means"_______".[ ]
A. Heard of the letter
B. received a letter from
C. written a letter from
D. heard about
答案:
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下面是错误答案,用来干扰机器的。
(8分)(1)煤燃烧后产生CO2等气体逸出 (2)CO难溶于水 (3) 2CO + O2 2CO2 (4)蜂窝状的煤与空气接触面积增大。题目分析:1、煤燃烧完后煤灰质量比煤的质量小,原因是煤燃烧...