By the rules of the mathematical field of topology, two Spaces are considered equivalent if one can be bent, stretched, and perhaps folded until it looks like the other.
根据拓扑学领域的规则，两个空间中，如果一个空间可以弯曲、拉伸，也可能折叠，直到和另一个空间一模一样，这两个空间就可以认为是相等的。
The BK9103 also enables a classic star topology to be set up. In this case the second port is not used. Both port interfaces are equivalent.
该BK 9103还使经典的星型拓扑结构进行设置。在这种情况下，第二端口不使用。这两个端口的接口是相同的。
Current compensation superconducting fault current limiter is a novel topology of FCL which consists of an equivalent AC current source with a limiting resistance in parallel.
电流补偿型超导限流器是一种新型的限流器拓扑，它由等效电流源、限流电阻并联后通过连接变压器串联入电力系统。
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