生产封隔器或者测试封隔器可能下入下套管的井段，而膨胀式封隔器可以在裸眼井段使用，也可以在下套管井段使用。
Production or test packers may be set in cased holes and inflatable packers are used in open or cased holes.
仪器适用于测试电缆、电容器、互感器、套管和高压电机的线圈等。
This instrument is appropriate for testing cables, capacitors, transformers, bushings, coils of high voltage machines, etc.
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