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问题
填空题
已知梯形的上底长为3cm,中位线长为6cm,则下底长为( )cm。
答案
9
选择题
He told me that the music was ______ worth _______ again.
A. well, to listen to
B. very, listening to
C. very, to listen to
D. well, listening to
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单项选择题 A1型题
变构酶的动力学曲线是()
A.S形曲线
B.钟形曲线
C.矩形双曲线
D.直线
E.平行线
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