高压电路发生三相短路时,其短路冲击电流有效值Ish的经验计算公式为()。 A: Ish=2.55IK B: Ish=1.51IK C: Ish=1.94IK D: Ish=1.09IK
高压电路发生三相短路时,其短路冲击电流有效值Ish的经验计算公式为()。 A: Ish=2.55IK B: Ish=1.51IK C: Ish=1.94IK D: Ish=1.09IK
在高压系统发生三相短路时,ish= I'',Ish= I'',在低压电路和1000kVA及以下变压器二次侧发生三相短路时,ish= I'',Ish= I''。
在高压系统发生三相短路时,ish= I'',Ish= I'',在低压电路和1000kVA及以下变压器二次侧发生三相短路时,ish= I'',Ish= I''。
The Start backwards key is used to _____ a program backwards.
The Start backwards key is used to _____ a program backwards.
短路冲击电流ish
短路冲击电流ish
Stern lines are used to prevent ship's backwards movement.
Stern lines are used to prevent ship's backwards movement.
…until we are marching backwards to the glorious age of the sixteenth century
…until we are marching backwards to the glorious age of the sixteenth century
短路冲击电流瞬时值ish和第一周期短路冲击电流有效值Ish各有什么不同?各有什么用途?
短路冲击电流瞬时值ish和第一周期短路冲击电流有效值Ish各有什么不同?各有什么用途?
The affix “-ish” in the word boyish conveys a ____meaning.
The affix “-ish” in the word boyish conveys a ____meaning.
根据1999年WHO/ISH标准,成人高血压为:
根据1999年WHO/ISH标准,成人高血压为:
Stern lines are used to prevent ship's backwards movement. A: 正确 B: 错误
Stern lines are used to prevent ship's backwards movement. A: 正确 B: 错误