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问题 选择题

The crowd cheered wildly at the sight of Liu Xiang, who was reported _____ the world record in the 110-metre hurdle race.
A. breaking
B. having broken 
C. to have broken
D. to break


答案

答案：C

解答题
当a=
3
，b=2时，计算：
a2-ab
a2
÷（
a
b
-
b
a
）的值．
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问答题 简答题

交流电动机启动困难并有嗡嗡声的可能原因有哪些？
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