【单选题】有关单相异步电动机的启动分相方式,描述不正确的是
A.
罩极式单相异步电动机,使用短路环的方式产生两个相位不同的磁通,进而产生旋转磁场。
B.
电阻启动分相式,启动绕组仅在电动机启动时起作用,待电动机进入正常运转后,启动绕组即可通过开关切除。
C.
电容启动运转式,启动电容仅在启动时起作用,运转电容在运行时一直留用。
D.
电容启动分相式,电容在启动和运行时均起作用,有较好的转矩特性。
【简答题】The company partly aims to release the burden from the Information Age.
【简答题】电容分相式单相异步电动机,在起动绕组电路中串入____是为了使起动绕组电流与工作绕组电流____,以产生旋转磁场而获得起动转矩。
【单选题】I suffered from mental__________ because of stress from my job.
【单选题】Vents are led from the engine to the head tank for the release of ____ from the cooling water.
【单选题】A seaman is entitled by law to a release from Foreign Articles when ______.
B.
deductions are made from wages
D.
the vessel is overloaded
【简答题】动物细胞冻存保护剂DMSO的常规使用浓度为____。
【单选题】动物细胞冻存保护剂DMSO的常规使用浓度为:
【判断题】单相 电容分相式异步电动机,在起动绕组电路中串入电容器是为了产生旋转磁场而获得起动转矩。
【单选题】I suffered from mental__________ because of stress from my job.A.damageB.release#
A.
I suffered from mental__________ because of stress from my job. A.damage