【简答题】9 )同步电机的功角 δ 有双重含义,一是 和 之间的夹角;二是 和 的 空间夹角。
【单选题】同步电机的功角δ有双重含义,一是( )和( )之间的夹角;二是( )和( )之间的夹角。
A.
主极轴线,气隙合成磁场轴线,励磁电动势,电压
C.
主极轴线,气隙合成磁场轴线,励磁电动势,电流
【多选题】在实际维修水泵的工作过程中,下列描述正确的是?
C.
检查水泵结合面有无泄漏,叶片有无破损,轴承有无松动等
【单选题】________On Ash Wednesday ashes are placed on the heads of participants to the accompaniment of the words "Remember that you are dust, and to dust you shall return".
【多选题】关于静液压系统的工作原理的叙述,正确的是()。
A.
柴油机曲轴自由端万问轴带动静液压变速箱,带动静液压泵
B.
静液压泵从油箱把油吸入后,通过压力管路将油送至液压马达
C.
液压马达在液压油的作用下进行旋转带动冷却风扇工作
D.
温度控制阀的自动控制使冷却风扇转速实现了无级变速,从而使柴油机的机油和冷却水达到了自动恒温控制
【多选题】Mei Lanfang composed many new melodies, introduced facial expressions, movements and the technique of dancing to the accompaniment of singing, from Kunqu Opera to Peking Opera; he also created various...
【简答题】水泵的作用是对冷却液( ).使冷却液在冷却系统中循环流动。
【简答题】同步电机的功角δ有双重含义,一是 和气隙合成磁场轴线之间的夹角;二是 励磁电动势和端电压空间夹角。
【单选题】由于突然断电,我正在编辑的文档白做了。
A.
Because the power was suddenly cut off, the file I was compiling was not saved.
B.
Because of the power was suddenly cut off, the file I was compiling was not saved.
C.
Because the power suddenly cut off, the file I was compiling was not saved.