TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: An electric generator is arranged between the booster engine and the one-way rotor on the transmission shaft. A constant-speed transmission device is arranged between the electromotor and the mechanical output device. A storage battery and a rectifier are arranged between the control circuit and the power supply respectively. The mechanical output device outputs driving power combined with natural power and electric power. The electromotor on the transmission shaft is replaced by a generating power-driving all-in-one machine. A constant-speed transmission device is arranged between the generating power-driving all-in-one machine and the mechanical output device. A storage battery and a rectifier are arranged between the control circuit and the power supply respectively. The rotating wheel is a vertical-axis wind wheel, a running-water rotating wheel or a wave rotating wheel. The one-way rotor is a one-way bearing or a ratchet wheel, and the mechanical output device a compressor, a dragger, a vacuum pump, an oil extractor, a water extractor or a winch. The mechanical output device is a dragger. A dragging rope capable of operating to and fro is supported on a supporting frame and the dragging rope driven by the dragger is connected with a carrier for carrying humans and/or objects. The mechanical output device is a vacuum pump. A transmission wheel is arranged on the transmission shaft. The transmission wheel is connected with a fan by a transmission belt. The fan is arranged at the input opening of a macromolecular oxygen permeable membrane. The output of the macromolecular oxygen permeable membrane is connected with the vacuum pump by a pipeline. The vacuum pump outputs oxygen-enriched air. The combination driving structures of natural power and electric power are arranged side by side. The mechanical output device is a compressor. The compressors are connected with each other in series. The output of the last compressor is connected with a gas storage tank and the gas storage tank stores compressed air. The output of the compressor is connected with a membrane assembly. A fluid medium is connected with the membrane assembly by the compressor and the membrane assembly outputs separated medium. The output of the compressor is connected with a heater, a filter and a hollow fiber membrane respectively in series and the air is separated into oxygen-enriched air and nitrogen by a pipeline through the compressor, the heater, the filter and the hollow fiber membrane. The combination driving structures of natural power and electric power are arranged side by side. The output of the first compressor is connected with the hollow fiber membrane, an intermediate gas storage tank, a second compressor, an intermediate gas storage tank, a third compressor and the gas storage tank. The air is separated into oxygen-enriched air and nitrogen by the hollow fiber membrane and the nitrogen is stored to the gas storage tank after being compressed with multiple stages.