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单项选择题

高层建筑内400㎡的观众厅、会议厅、多功能厅宜设置在：( )

A.地下1、2层
B.首层或2、3层
C.4层及4层以上
D.顶层
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The children and their parents had great fun_______games in the park．
A.playing
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I asked him to go to the art exhibition, but he said he had_______seen it．
A.still
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判断题
函数ψ(t) 构成正交分数阶小波的充要条件是矩阵M(ucscα) 是酉矩阵。
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