他很灵活 发表于 2025-3-23 12:27:57

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关节炎 发表于 2025-3-23 14:08:11

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Optimum 发表于 2025-3-23 21:54:58

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彩色 发表于 2025-3-23 22:14:39

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Malaise 发表于 2025-3-24 04:04:52

Book 1982enchyma in the form of a commercial fibre? If it is possible, it is not easy. Although, for many purposes, plant fibres are being replaced by man-made fibres, vegetable fibres are still used, particularly in sacking and cordage and in some indus­ trial materials. Articles which must be examined in a

保留 发表于 2025-3-24 07:23:36

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Interregnum 发表于 2025-3-24 14:40:44

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implore 发表于 2025-3-24 18:20:15

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滑稽 发表于 2025-3-24 21:43:21

Hemp,nd as an animal feed. Oil extracted from the seed is a substitute for linseed oil in paint and varnish and is also used in soap-making. Like most plants of economic importance, hemp has frequently been studied by botanists. Its wide distribution, its varying form and its response to environment have

archaeology 发表于 2025-3-25 02:24:33

Sunn Hemp,t important commercially is C. . which is grown as a fibre crop. Most sunn hemp is grown in India where there are three main varieties, White, Genjan and Dewghuddy. The quality of the fibre is very variable.
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查看完整版本: Titlebook: Identification of Vegetable Fibres; Dorothy Catling,John Grayson Book 1982 D. M. Catling and J. E. Grayson 1982 anatomy.environment.flax.p