The optimum programme can be used to design four-connecting lever pneumatic roof-window mechanism of all kinds of multi-span plastic greenhouses by changing load and structure parameters.
通过改变载荷参数和结构参数，优化模型可用于其它塑料温室的气动四连杆天窗机构的设计。
It also introduced all-plastic fan structure and technical measures for reducing creep and stress relaxation.
介绍了全塑风扇的结构和减少蠕变、应力松弛等技术措施。
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