刀架底座 tool rest bracket ; knife holder base
井架底座 derricksubstructure ; substructure ; derrick support ; derrick base
井架底梁 derrick sill
铝制支架底板 aluminum stabilizer base
弹弓式井架底座 slingshot substructure
井架底尺寸 derrick base size
支架底座 Baseplate
小型井架底座 pony-substructure
托架底座 carrier base ; bracket base
刀架底板 bottom slide of saddle
各 液压缸的下支点与横向行走机架固定，液压缸的顶端与承重架底平面 连接。
The lower fulcrum of each hydraulic cylinder is fixed with the transverse walk frame; the top of the hydraulic cylinder is connected with the bottom plane of the bearing frame.
仅波音787一种从其在2003年年底投放市场至今就网罗了261架的订单和订货承诺：在几年之内，波音可能会重新从空客手中赢回半壁江山。
The 787 alone has netted 261 orders and firm commitments since its launch at the end of 2003: within a few years Boeing may have won back over half the market from Airbus.
两架飞机都是在2008年底交付。
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