试题与答案

蒸汽压缩式制冷循环中的节流过程近似是()。

题型:填空题

题目:

蒸汽压缩式制冷循环中的节流过程近似是()。

答案:

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参考答案:种子寿命常把生长发育正常、没有机械损伤的种子、在一定环境条件下能维持生命力的年限称为种子寿命。(1)内因种皮的养分状况含脂肪和蛋白质的种子寿命比含淀粉多的种子寿命长。种皮的结构一些种子的种...

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