花生于无梗伞形花序,有或没有叶在基部。
网络管理信息标准,在802伞形标准中有详细说明,1993年获得批准。
Standard for defining network management information specified in 802 umbrella standards. Approved in 1993.
伞形结构作为一种新型钢结构形式在国内首次开始应用,其施工方法与常规方法不同。
Umbrella-shaped structure, a new steel structure, is firstly used in our country, whose construction technology is different from the usual measures.
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