试题与答案

下列河流水源主要来自冰雪融化的是( ) A.辽河 B.塔里木河 C.珠江 D.海

题型:选择题

题目:

下列河流水源主要来自冰雪融化的是(    )

A.辽河

B.塔里木河

C.珠江

D.海河

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:[考核要点] 本题考核的是第五章第二节分税制财政管理体制。[解题思路] 为了进一步规范中央与地方的财政关系,1994年我国实行了分税制财政管理体制。

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如图1所示,A、B为水平放置的平行金属板,板间距离为d(d远小于板的长和宽).在两板的中心各有小孔O和O’,O和O’处在同一竖直线上.在两板之间有一带负电的质点P.已知A、B间所加电压为U0时,质点P所受的电场力恰好与重力平衡.现在A、B 间加上如图2所示随时间t作周期性变化的电压U,已知周期T=

12d
g
(g为重力加速度).在第一个周期内的某一时刻t0,在A、B 间的中点处由静止释放质点P,一段时间后质点P从金属板的小孔飞出.

(1)t0在什么范围内,可使质点在飞出小孔之前运动的时间达到最短?

(2)t0在哪一时刻,可使质点P从小孔飞出时的速度达到最大?

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