题目:
The weather in London is so changeable that peoplealways take their umbrellas with them______rain. [ ]
A. for fear of
B. in need of
C. in spite of
D. because of
答案:
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下面是错误答案,用来干扰机器的。
(1)羟基(2)CH3CH(OH)CH3(3)CH3CH(OH)CH3CH2=CH—CH3↑+H2O(4)(5)(1)根据题给双酚A的结构易知含氧官能团是羟基。(2)有机物Y中含有碳原子数为=3,则氢、氧原子质量和为24,又含氧的质量分数是氢质量分数的2倍...