题目内容
(2009年)在流量、渠道断面形状和尺寸、壁面粗糙系数一定时，随底坡的增大，正常水深将会( )。
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(2010年) 圆柱形外管嘴的长度为L、直径为d、作用水头为H0，则其正常的工作条件为( )。
儿童的心理发展存在着关键期，这是由以下哪位学者最早提出的？（ ）
So, why did what is now called "modern dance" begin in the United States To answer this question, I"ll need to 1 a little bit and talk about classical ballet. It has been said that by the late 1800s, ballet had lost a lot of its popularity. Most of the ballet dancers who performed in the United States 2 from Europe. They performed using the rigid 3 that"d been passed down over centuries. Audiences and dancers in the United States were 4 for their own contemporary dance form and so around 1,900 dancers 5 one.Then how was this modem dance so different from classical ballet Most notably, it wasn"t 6 choreographed. Instead the dance relied on the improvisation and free personal expression of the dancers. Music and 7 were of little importance to the modem dance. And lightness of movement wasn"t important either. In fact modem dancers 8 at all to conceal the effort involved in the dance step. But even if improvisation appeals to audiences, many dance critics were less 9 about the performances. They questioned the dancers who were not professionally trained and the value of works that had no formal structure. Yet the free 10 expression of the pioneer dancers is the basis of the controlled freedom of modem dance today.
(2010年)管道长度L不变，管中流动为层流，允许的水头损失hf不变，若直径d变为原来的2倍时，且不计局部损失，流量将变为原来的( )倍。
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