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恒温恒湿试验机中单级制冷循环基本上采用的中温制冷剂是R404A,在一个大气压下其蒸发温度是-46.5℃(R22/-40.7℃),但空气冷却式冷凝器传热温差通常取10℃左右(在强制送风散热循环下,蒸发器和内箱的温差),就是说箱内只能制取-36.5℃的低温,当然,通过调低压缩机的蒸发压力,可以将R404A制冷剂的最低蒸发温度降低到-50℃;所以要获取-50℃及以下的低温时必须采用中温制冷剂与低温制冷剂复叠式的制冷循环,制取-50℃~-80℃的低温,低温制冷剂一般选用R23它在一个大气压下的蒸发温度是-81.7℃。

Paris, France.
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  • Duration : 10 Days

第13,14和15章,材料疲劳试验机销售渠道,分销商,贸易商,经销商,研究结果和结论,附录和数据来源。

Los Angles, USA.
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  • Duration : 10 Days

预计周末大多数风暴将在肯塔基州北部举行,少数人可能会在下午的父亲节活动。周日没有多少人会遇到暴风雨,但是,一些社区可能会遭遇大雨,闪电和阵风。

Agra, India.
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  • Duration : 10 Days

第4章模块化类型的全球稳定性测试分庭2013-2017市场分析和机会评估,2018-2028

Paris, France.
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  • Duration : 10 Days

Enjoy The Trip

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China

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