No one yet knows what made Derrick Bird attack these people, who seem to have included his twin brother and colleagues from work as well as total strangers, before killing himself.
目前还没有人知道什么让DerrickBird在杀死自己前向这些人们发动袭击，其中似乎还包括他的孪生兄弟和同事以及完全不相干的陌生人。
Equipped with suitable derrick and well controlled device in drilling a shallow gas well water drills proved to be able to reduce shallow gas well drilling cost.
通过某浅层气井的施工实例，阐述了水井钻机安装合适的钻塔底座和并控装置，可降低浅层气井建井成本。
Equipped with suitable Derrick and well controlled device in drilling a shallow gas well, water drills proved to be able to reduce shallow gas well drilling cost.
通过某浅层气井的施工实例，阐述了水井钻机安装合适的钻塔底座和并控装置，可降低浅层气井建井成本。
There is a high requirement for the derrick substructure of the ultra-deep well in structural form, layout of component parts and main materials.
超深井钻机井架底座在结构形式、构件布局、主体材料的选取等方面均有较高要求，常规的井架、底座主体材料难以满足超深井钻机特定的载荷和工况要求。
The actual wellbore length from the kelly bushing (KB), derrick floor (DF), foundation or ground level (GL), to a point in the well or bottom of the well.
从方钻杆补心(KB)、钻台(DF)、底座或者地面标高(GL)到井中测量点或者井底的实际井筒长度。
The actual wellbore length from the kelly bushing (KB), derrick floor (DF), foundation or ground level (GL), to a point in the well or bottom of the well.
从方钻杆补心(KB)、钻台(DF)、底座或者地面标高(GL)到井中测量点或者井底的实际井筒长度。
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