【单选题】You are reconnecting a three-phase induction motor to the supply line. To prevent possible damage to the load, due to the wrong direction of rotation, you should ______.
A.
connect the motor and then use the 'jog' button to determine the direction of rotation
B.
connect the phase indicator to the motor leads, rotate the motor by hand and then connect to the supply voltage
C.
connect the phase indicator to the supply voltage then connect the motor
D.
check the supply line phase sequence and motor rotation with appropriate indicators, then connect correspondingly marked leads
【单选题】下列关于工程设计阶段的描述,正确的是( )
C.
设计阶段是决定建设工程价值和使用价值的主要阶段
【多选题】两因素交叉分组有重复数据资料方差分析中的效应包括
【单选题】呈卵圆形或椭圆形,表面有网状沟纹,断面可见大理石样花纹,气香浓烈的药材是
【单选题】Jazz journalism is characterized by which of the following features
B.
abundance of photographs
【单选题】断面可见棕白相间的大理石样花纹的药材( )