... 井架大门高度 v-door height 井架大门开档尺寸 v-door demensions 井架构件 derrick member ...
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Derrick guy wire as the special supporting member of downhole derricks, its performance has much impact on the mechanical behavior of derricks.
绷绳作为作业井架的特殊支承构件,其工作特性对作业井架的力学行为有较大影响。
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Acting leader and cabinet member for the environment Bill Borrett has been selected to replace Derrick Murphy.
BBC: Norfolk County Council chooses new leader
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