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【判断题】
固体 发生偏聚、内吸附现象是自扩散结果。A.
正确
B.
错误
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举一反三
【单选题】what caused the car ahead of Jonda to slip into the Dalton River
A.
The car did not slow down
B.
The car had a braking problem
C.
The car was barely within the lane
D.
The car failed to stop at the warnming sign
【简答题】3 电动机铭牌上标的额定电压指的是电动机绕组的__________,某三相异步电动机的额定电压为220V,当电源电压为220V时,定子绕组应该采用__________接法;当电源电压为380V时,定子绕组应该采用__________接法。
【单选题】What caused the car ahead of Jonda to slip into the Dalton River?
A.
The car did not slow down.
B.
The car had a braking problem.
C.
The car was barely within the lane.
D.
The car failed to stop at the warning sign.
【单选题】What caused the car accident?
A.
Amy ran a stop sign which led the car to crash into a large truck.
B.
Amy continued into the intersection without stopping.
C.
The driver of a large truck, unable to brake in time, ran into our car.
【简答题】异步电动机的额定电压是220V/380V，当三相电源的线电压分别是220V和380V时，问电动机的定子绕组各应用何种接法?在这两种接法下，问：
【单选题】三相异步电动机的接线盒中六个接线端，可以改变三相定子绕组的接线方法，某点的铭牌上标有“额定电压280、220V，接法Y/△”，这是指( )。
A.
当电源相电压为220V，时，将定子绕组接成三角形，相电压为380V，接成星形
B.
当电源相电压为220V，线电压380V时，采用Y/△换接
C.
当电源相电压为380V时，将定子绕组接成星形，线电压为220V时，接成三角形
D.
当电源相电压为380V时，将定子绕组接成三角形，线电压为220V时，接成星形
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