发布时间:2025-02-03 12:05:42
娃娃菜莲座期即可发病,初时叶边缘干枯、向内卷缩,轻者生长受到抑制,重者包心不紧实、甚至不包心。结球初期,叶边缘出现水渍状,并呈黄色透明,逐渐发展成黄褐色焦叶,向内卷曲。结球后期,病株外观无异常,但内部球叶黄化、发粘、变质,不能食用。
听说美的midea出了精密空调,是说空调控温什么的比较精确吗
2025-02-03 12:05:42 2025-02-03 12:05:42怎样改善或者延缓不饱和聚酯树脂,乙烯基树脂比如191,196,189等树脂固化时间和质量
2025-02-03 12:05:42这种卷帘门落下后总有道缝隙刮风往里边进土请问有什么办法可以密封住防止灰尘刮入
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