更多“ 运动粘度<img src="https://nimg.ppkao.com/2019-04/wuacheng/201904191635595985.jpg?sign=991692dad0944b3e5411ac6ae138e18d&t=62d73c3e" />的油液通过水平管道，油液密度ρ=900kg/m<sup>3</sup>，管道内径d=10mm，l=5m，进口压力P<sub>1</sub>＝4.0MPa，问流速为3m/s时，出口压力P<sub>2</sub>为多少？”相关的问题
A、A.<img src="https://img.ppkao.com/2017-09/zhangyijie/2017091312354834040.jpg" />
B.<img src="https://img.ppkao.com/2017-09/zhangyijie/2017091312355215288.jpg" />
C.<img src="https://img.ppkao.com/2017-09/zhangyijie/2017091312355747238.jpg" />
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、在如图所示的凸轮机构中，已知凸轮以角速度ω顺时针方向转动，令推杆的运动速度以v表示，凸轮的基圆半径以r0表示，行程以h表示，偏距以e表示，压力角以α表示，推杆位移以s表示，凸轮的推程运动角以<img src="https://img.ppkao.com/2018-08/lina/2018082916163576812.jpg" />表示，回程运动角以<img src="https://img.ppkao.com/2018-08/lina/2018082916163916287.jpg" />表示，远休止角以<img src="https://img.ppkao.com/2018-08/lina/201808291616447809.jpg" />表示，近休止角以<img src="https://img.ppkao.com/2018-08/lina/2018082916164818383.jpg" />表示，A为实际廓线推程起始点，B为实际廓线推程终止点，C为实际廓线回程起始点，D为实际廓线回程终止点。试作图表示：凸轮的理论廓线；凸轮的基圆半径r0；推杆的行程h；当前位置时的压力角α和位移s；凸轮的偏距e；凸轮的推程运动角<img src="https://img.ppkao.com/2018-08/lina/2018082916163576812.jpg" />、回程运动角<img src="https://img.ppkao.com/2018-08/lina/2018082916163916287.jpg" />、远休止角<img src="https://img.ppkao.com/2018-08/lina/201808291616447809.jpg" />、近休止角<img src="https://img.ppkao.com/2018-08/lina/2018082916164818383.jpg" />。
<img src="https://img.ppkao.com/2018-08/lina/2018082916165292121.jpg" />
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、图中沿着半径为R圆周运动的质点，所受的几个力中有一个是恒力<img src="https://img.ppkao.com/2019-04/wangjue/2019042617292572063.jpg" />，方向始终沿x轴正向，即<img src="https://img.ppkao.com/2019-04/wangjue/201904261730037303.jpg" />，当质点从A点沿逆时针方向走过3/4圆周到达B点时，力<img src="https://img.ppkao.com/2019-04/wangjue/2019042617292572063.jpg" />所作的功为W＝（）
<img src="https://img.ppkao.com/2019-04/wangjue/2019042617301494850.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、A.<img src="https://img.ppkao.com/2017-07/wumeiyan/2017073014281280624.jpg" />
B.<img src="https://img.ppkao.com/2017-07/wumeiyan/2017073014281819043.jpg" />
C.<img src="https://img.ppkao.com/2017-07/wumeiyan/2017073014282618868.jpg" />
D.<img src="https://img.ppkao.com/2017-07/wumeiyan/2017073014283326403.jpg" />
A、A.<img src="https://img.ppkao.com/2018-09/zenglei/2018092911015090840.jpg" />
B.<img src="https://img.ppkao.com/2018-09/zenglei/2018092911020511940.jpg" />
C.<img src="https://img.ppkao.com/2018-09/zenglei/2018092911020978687.jpg" />
D.<img src="https://img.ppkao.com/2018-09/zenglei/201809291102144859.jpg" />
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