布赫继电器有一个测试口，测试时聚集的气体可以从此口散出。
Buchholz relays have a test port to allow the accumulated gas to be withdrawn for testing.
由于微孔很小且很多，所以，异丙酮气体不会溢散出来，保护周围的空气；
As the micro holes are in small size and in a plurality-quantity, the isopropyl acetone air cannot flow out and the atmosphere air can be protected.
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