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提高服务质量,通过哪两个方面?

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现行成都个体参保缴费标准是多少?

柜式配电设备的母线侧封板应使用专用螺丝和工具,柜内有电时禁止开启。()

A. 正确
B. 错误

Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()

A shortage of liquid refrigerant
B. Excessive frost on the evaporator
C. Excessive condenser cooling water
D. Insufficient condenser cooling water flow

分片法球壳组焊工序有:①点固焊、②纵缝焊接、③环缝焊接、④焊后总体检查。其正确的焊接工序是()

A. ①②③④
B. ②①③④
C. ③①②④
D. ①③②④

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