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单项选择题
The children and their parents had great fun_______games in the park.
A.playing
B.play
C.played
D.toplay
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单项选择题
I asked him to go to the art exhibition, but he said he had_______seen it.
A.still
B.already
C.also
D.often
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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。
单项选择题
《无障碍设计规范》规定,桥梁、隧道的人行道应与道路的人行道衔接,当地面有高差时,应设轮椅坡道,坡道的坡度不应大于:( )
A.1:20
B.1:16
C.1:15
D.1:12
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