【单选题】The energy consumed by an AC motor, as strictly reactive power, is_____ .
A.
used to do mechanical work
B.
lost in doing work to turn the motor itself
C.
used to establish the magnetic field of the motor
D.
lost as heat generated by the windings
【多选题】Which motor is primary if AC power is available?
A.
Squirrel-cage induction motor
C.
wound-rotor induction motor
【单选题】二阶环节G(s)=10/(S 2 +3.6S+9)的阻尼比应为()
【简答题】django restful应用可通过rest_framework.pagination.PageNumberPagination实现分页,__________属性用于定义每页包含的数据条目。
【单选题】二阶环节 G ( s )=10/( s 2 +3.6 s +9) 的阻尼比为( )。
【单选题】Django 2.2 restful应用中,定义视图类时需要给________字段赋值,以便视图返回时数据模型数据
【单选题】Django 2.2 restful应用中,数据模型类为User,获取该模型所有数据的写法是______。
【单选题】下列各项中, 不 可以使用红色墨水记账的情况有
B.
在三栏式账户的余额栏前,如未印明余额方向的,在余额栏内登记负数余额
D.
根据国家统一的会计制度的规定可以用红字登记的其他会计记录
【单选题】The energy consumed by an AC motor, as strictly reactive power, is ____.
A.
used to do mechanical work
B.
used to establish the magnetic field of the motor
C.
lost as heat generated by the windings
D.
lost in doing work to turn the motor itself