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1. The test amplifier is used to measure the resistance of the circuit.
测试放大器用于测量电路的电阻。
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2. The engineer used the test amplifier to test the electronic device.
工程师使用测试放大器来测试电子设备。
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3. The test amplifier was used to detect any faults in the circuit.
测试放大器被用来检测电路中的任何故障。