【简答题】均匀磁场中,一重量为W的物体经无摩擦滑轮拉着金属杆,使金属杆在相距为,的平行导线上滑动(不计摩擦),双线一端接电阻R,导线平面与 垂直,如图6.5所示。
【多选题】Hesitation fillers help you overcome communication difficulty. But too many hesitation fillers will produce the opposite effect, because .
A.
Too many hesitation fillers make others believe you are not confident.
B.
Too many hesitation fillers make your speech not fluent and sound uncomfortable.
C.
When you are giving lectures or speeches, using too many hesitation fillers show that you are not well prepared.
【判断题】电压互感器在使用过程中,二次侧不允许开路。
【单选题】对设计站历年水位流量关系曲线对比分析的目的是 。
【单选题】如图所示,用甲、乙两个滑轮组来提相同重物G,甲图中两个动滑轮共重5N,乙图中一个动滑轮重3N,不计摩擦和绳重,则两个滑轮组的机械效率( )
【单选题】对设计站历年水位流量关系曲线对比分析的目的是
【单选题】对设计站历年水位流量关系曲线对比分析的目的是
【判断题】电压互感器在使用过程中,二次侧不允许开路。( )
【判断题】Hesitation fillers give you more time to think what to say next and send a signal to the other person that you’re stuck in the middle of a sentence and that you have not finished speaking.
【单选题】如图所示的装置中,不计滑轮摩擦,当水平向右拉力F=5N时,物体m恰能匀速运动,那么物体受地面的摩擦力的大小为( )。