更多“ 设<img src="https://nimg.ppkao.com/2019-04/wangjue/2019042416460320059.jpg?sign=70fe8f0bd7110b971dfe9588f39e6eba&t=62d7ed53" /><br /> （1）当一质点从原点运动到<img src="https://nimg.ppkao.com/2019-04/wangjue/2019042416461912806.jpg?sign=f723c124210ddbc824a05ec628d3766a&t=62d7ed53" />时，求<img src="https://nimg.ppkao.com/2019-04/wangjue/2019042416463483050.jpg?sign=d68f4a51f013cc810f2ef623e0f6740b&t=62d7ed53" />所作的功。<br /> （2）如果质点到r处时需0.6s，试求平均功率。<br /> （3）如果质点的质量为1kg，试求动能的变化。”相关的问题
A、A.<img src="https://img.ppkao.com/2019-04/xiaotian/201904121621063148.jpg" />
B.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041216210959959.jpg" />
C.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041216211392394.jpg" />
D.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041216211784478.jpg" />
A、A.上部设2<img src="https://img.ppkao.com/2018-07/wenxueying/2018071612381615622.png" />22的通长钢筋
B.上部设41<img src="https://img.ppkao.com/2018-07/wenxueying/2018071612381615622.png" />2的架立钢筋
C.A轴支座上部纵筋与B轴支座两侧的上部纵筋相同
D.B轴支座两侧的上部纵筋为3<img src="https://img.ppkao.com/2018-07/wenxueying/2018071612381615622.png" />22+3<img src="https://img.ppkao.com/2018-07/wenxueying/2018071612381615622.png" />25
E.C轴支座上部纵筋设在下排的钢筋是4<img src="https://img.ppkao.com/2018-07/wenxueying/2018071612381615622.png" />22
A、（1）设总体<img src="https://img.ppkao.com/2019-04/wuacheng/2019041516401032807.jpg" />参数σ2已知<img src="https://img.ppkao.com/2019-04/wuacheng/2019041516404264804.jpg" />是来自X一个样本值。求μ的最大似然估计值。
（2）设总体<img src="https://img.ppkao.com/2019-04/wuacheng/2019041516410433618.jpg" />参数μ已知<img src="https://img.ppkao.com/2019-04/wuacheng/2019041516412861381.jpg" />为一相应的样本值。求σ2的最大似然估计值。
A、A.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />三态，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />低电平
B.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />三态，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
C.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />高电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
D.<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309154866509.jpg" />高电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155838776.jpg" />低电平，<img src="https://img.ppkao.com/2017-10/wangjinchen/2017101309155342124.jpg" />高电平
A、设总体<img src="https://img.ppkao.com/2019-04/wuacheng/2019041516264647619.jpg" />是来自X的样本，求m，p的矩估计量（对于具体样本值，若求得的<img src="https://img.ppkao.com/2019-04/wuacheng/2019041516271083671.jpg" />不是整数，则取与<img src="https://img.ppkao.com/2019-04/wuacheng/2019041516274483684.jpg" />最接近的整数作为m的估计值）。
A、A.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />不变，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />增大
B.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />减小，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />不变
C.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />减小，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />增大
D.<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716370781231.jpg" />增大，<img src="https://img.ppkao.com/2017-12/xieqiushi/2017120716372262539.jpg" />减小
A、A.<img src="https://img.ppkao.com/2018-04/zhouyun/20180412175605391.jpg" />
B.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562114745.jpg" />
C.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562651092.jpg" />
D.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217562929580.jpg" />
E.<img src="https://img.ppkao.com/2018-04/zhouyun/2018041217563332745.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516571386102.jpg" /><img src="https://img.ppkao.com/2018-08/chenfang/2018081516572558372.jpg" />
B.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516572062708.jpg" />
C.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516572915872.jpg" />
D.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516573482159.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116564316705.jpg" />
B.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116564929545.jpg" />
C.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116565492959.jpg" />
D.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116570158166.jpg" />
E.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116570766172.jpg" />
F.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116571469081.jpg" />
A、如题图所示，设B点发出的平面横波沿BP方向传播，它在B点的振动方程为<img src="https://img.ppkao.com/2019-04/liyunao/2019041616333460033.jpg" />
C点发出的平面横波沿CP方向传播，它在C点的振动方程为<img src="https://img.ppkao.com/2019-04/liyunao/2019041616334242069.jpg" />，本题中Y以m计，t以s计．设BP＝0.4m，CP＝0.5m，波速u=0.2m·s-1
<img src="https://img.ppkao.com/2019-04/liyunao/2019041616332795297.jpg" />
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