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[单选] To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the ().

A . discharge service valve as a vapor
B . suction service valve as a liquid
C . charging valve as a liquid
D . condenser purge valve as a vapor

输气站运行值班人员汇报操作结束时,应报“操作结束时间”。“()”是现场操作执行完毕的依据,值班调度员只有在收到上报的“操作结束时间”后,该项操作才算执行完毕。 焊接零部件质量控制主要包括()。 尺寸精度。 焊接强度。 外观质量。 过程质量。 If the situation arose where it became necessary to tow a disabled vessel,which statement is TRUE concerning the towing line?(). The towing line between the two vessels should be clear of the water。 The towing line should be taut at all times between the vessels。 There should be a catenary so the line dips into the water。 None of the above。 船艏失火的警报信号是汽笛或警铃短声连放一分钟后继三长声。 要扩大空间以方便键入备注和查看备注页的外观,请在“视图”菜单中单击() 大纲。 备注页。 页面。 标记。 To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the ().
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