6208向心轴承内圈与<img src='https://img2.soutiyun.com/ask/uploadfile/5142001-5145000/9a4cdeb3189cf0bd64b575bb7f578177.png' />轴颈配合，形成( )。

当向心轴承内圈与轴颈配合较紧，外圈与壳体配合较松吋，它的安装顺序是应先（）。

向心球轴承装配，当内圈与轴配合较紧，外圈与壳体较松时，应先将轴承装在（）。

向心球轴承的内圈与轴配合较紧，外圈与座孔配合较松时，应先装外圈。

已知某个电路元件上的电压和电流为<img src="https://img2.soutiyun.com/ask/2020-07-07/96296750308178.png"/><img src="https://img2.soutiyun.com/ask/2020-07-07/962967514498434.png"/>求电压与电流的相位差。

级数<img src='https://img2.soutiyun.com/latex/latex.action' />与∑<img src='https://img2.soutiyun.com/latex/latex.action' />满足u_n≤v_n(n=1，2，…)，则( )．

平面Ⅱ:2x-4y+3z-1=0与直线<img src='https://img2.soutiyun.com/latex/latex.action' />的位置关系是( )

5．直线<img src='https://img2.soutiyun.com/latex/latex.action' />与平面x-y-z-5=0的关系是( )

一联轴器，由分别分布在半径为R₁和R₂圆周上的8只直径相同的螺栓耗联接(如图所示)。则内圈(R₁)螺栓横截面上的切应力τ₁与外圈(R₂)螺栓横截面上的切应力τ₂的比值为( )。<img src='https://img2.soutiyun.com/ask/5763001-5766000/48207949b48a9e9bedcb87827bdcc2e3.jpg' />

直线<img src='https://img2.soutiyun.com/ask/2020-02-18/950884563792837.png' />与直线<img src='https://img2.soutiyun.com/ask/2020-02-18/950884577991765.png' />的关系是( )

若级数<img src='https://img2.soutiyun.com/latex/latex.action' />与<img src='https://img2.soutiyun.com/latex/latex.action' />分别收敛于S₁与S₂，则( )式未必成立．

下图为滑动轴承的装配图，下列叙述错误的是（）。<img src='' jquery111001737148251636086=' /><img src='https://img2.soutiyun.com/ask/uploadfile/5982001-5985000/a9d583af8813460589012dbf36958224.jpg' />

结合肺段模式肺动脉干与右肺动脉层面(如图)，选出右肺中叶的组成()<img src='https://img2.soutiyun.com/shangxueba/ask/17562001-17565000/17562091/2014060417141556038.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/17562001-17565000/17562091/2014060417143089113.jpg' />

结合肺段模式肺动脉干与右肺动脉层面、心室层面、主动脉弓层面、左右心房层面图(如图)，选出左肺下叶的组成()<img src='https://img2.soutiyun.com/shangxueba/ask/17568001-17571000/17568130/2014060417075415384.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/17568001-17571000/17568130/2014060417080425082.jpg' />

过点M（3，-2，1）且与直线<img src='https://img2.soutiyun.com/shangxueba/ask/18729001-18732000/18730661/2016071514231735481.jpg' />平行的直线方程为（）<img src='https://img2.soutiyun.com/shangxueba/ask/18729001-18732000/18730661/2016071514234648431.jpg' />

下列化合物不能与<img src='https://img2.soutiyun.com/shangxueba/ask/17844001-17847000/17845710/2016032015180822263.jpg' />发生反应的是（）。<img src='https://img2.soutiyun.com/shangxueba/ask/17844001-17847000/17845710/2016032015181816392.jpg' />

一台4极中型异步电动机，P_N=200kW，U_N=380V,定子0联接，定子额定电流I_N=385A,频率50Hz,定子铜耗<img src='https://img2.soutiyun.com/ask/2021-01-03/978560273352189.png' />=5.12kW.转子铜耗<img src='https://img2.soutiyun.com/ask/2021-01-03/978560286697952.png' />=2.85kW,铁耗<img src='https://img2.soutiyun.com/ask/2021-01-03/978560298531629.png' />=3.8kW，机械损耗<img src='https://img2.soutiyun.com/ask/2021-01-03/97856031340548.png' />=0.98kW，附加损耗<img src='https://img2.soutiyun.com/ask/2021-01-03/978560322980028.png' />=3kW，<img src='https://img2.soutiyun.com/ask/2021-01-03/978560339469971.png' />.正常运行时<img src='https://img2.soutiyun.com/ask/2021-01-03/978560353474772.png' />，起动时<img src='https://img2.soutiyun.com/ask/2021-01-03/978560375203015.png' />，由于磁路饱和与趋肤效应的影响，<img src='https://img2.soutiyun.com/ask/2021-01-03/978560441999835.png' /><img src='https://img2.soutiyun.com/ask/2021-01-03/97856039470213.png' />.试求:

患者，男，5岁，前牙反<img src='https://img2.soutiyun.com/shangxueba/ask/18504001-18507000/18505294/2015091816213562067.jpg' />，后牙近中错<img src='https://img2.soutiyun.com/shangxueba/ask/18504001-18507000/18505294/2015091816213562067.jpg' />，反覆<img src='https://img2.soutiyun.com/shangxueba/ask/18504001-18507000/18505294/2015091816213562067.jpg' />深，反覆盖小，牙齿无松动，牙列整齐，不伴拥挤。斜面导板斜面与牙体长轴所呈的角度为（）

自正中关系位能自如滑行至正中<img src='https://img2.soutiyun.com/shangxueba/ask/19008001-19011000/19008852/2015091014132537512.jpg' />，表明正中关系与正中<img src='https://img2.soutiyun.com/shangxueba/ask/19008001-19011000/19008852/2015091014132537512.jpg' />在（）。

烟气在加热炉回热装置中流动，拟用空气介质进行实验。已知空气黏度<img src='https://img2.soutiyun.com/shangxueba/ask/19014001-19017000/19015543/2016071910033856383.jpg' />，烟气运动黏度<img src='https://img2.soutiyun.com/shangxueba/ask/19014001-19017000/19015543/2016071910034077744.gif' />，烟气流速<img src='https://img2.soutiyun.com/shangxueba/ask/19014001-19017000/19015543/2016071910034354291.jpg' />，如若实际与模型长度的比尺λ_L=5，则模型空气的流速应为：（）

如图所示为某轴承座的立体图，图中B点方向为主视方向，它所对应的三视图为（）<img src='https://img2.soutiyun.com/shangxueba/ask/18390001-18393000/18390094/2016071716574530204.gif' />

下列不是与前伸<img src='https://img2.soutiyun.com/shangxueba/ask/17496001-17499000/17497891/2015093011385564776.jpg' />平衡相关的因素的是（）

已知物块与水平面间的摩擦角<img src='https://img2.soutiyun.com/shangxueba/ask/17850001-17853000/17852448/2017032913311854240.jpg' />，今用力F1=0.5kN推动物块，P=1kN。则物块将（）。<img src='https://img2.soutiyun.com/shangxueba/ask/17850001-17853000/17852448/2017032913312295581.jpg' />

在RLC串联电路中，电压与电流之间的相位差为<img src='https://img2.soutiyun.com/shangxueba/ask/2022-01/18/1118/20220118103755650.png' />，则<img src='https://img2.soutiyun.com/shangxueba/ask/2022-01/18/174/20220118103803306.png' />为()。

向心球轴承安装顺序是：当内圈与轴颈配合较紧,外圈与壳体配合较松时,应先将轴承（)。