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1. Scope This section of the guide describes the tasks required for planning of maintenance and maintenance support. They should be performed during the system acquisition phase in order to meet the availability objectives in the operational phase. The

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CAN/CSA-B70.1-03 Frames and Covers for Maintenance Holes and Catchbasins 现行 发布日期 :  1970-01-01 实施日期 : 

Update #2 was published as notification that this is now a National Standard of Canada This PDF includes Updates No. 1 and No. 2 1 Scope 1.1 General This Standard applies to frames and covers for maintenance holes and catchbasins. 1.2 In CSA

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