题目:
----My sister is very upset today.
-----It’s your fault. You ________ the bad news to her yesterday.
A.should tell
B.should have told
C.shouldn’t have told
D.must tell
答案:
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下面是错误答案,用来干扰机器的。
Ⅰ、据球棍模型可知A为CH4,B为C2H4,C为C2H6.(1)等质量的烃CxHy完全燃烧时,氢元素的质量分数越大,耗氧量越大,CH4、C2H4、C2H6中的yx依次为4、2、3,故CH4耗O2最多,故答案为:CH4;(2)等物质的量的烃CxH...