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有一台单相变压器,额定容量为 10 kV·A ,二次侧额定电压为 220 V ,要求变压器在额定负载下运行。二次侧能接 220 V/40 W ,功率因数为 0.44 的日光灯 支?设每灯镇流器的损耗为 8 W 。 得分/总分
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【判断题】植物病害的症状包括变色、坏死、腐烂、萎蔫和畸形等。
A.
正确
B.
错误
【简答题】V. In 1955, Ray Kroc visited a small restaurant in California. The restaurant was built next to the road, so customers could drive up to the restaurant and drive away easily. The restaurant was owned ...
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