随着技术的进步，半潜式钻井平台和钻井船不断更新换代，额定作业水深和钻深能力相应增大。
Continued technological advances are pushing the rated depth of underwater operation and drilling capacity to record highs.
针对不同的加工要求，我们研制几款钻型精孔钻、半孔钻等以满足加工要求。
To meet different needs of processing holes , several kinds of jigs have been developed such as high-precision-hole jig, half-hole jig etc.
而半波数则与钻柱长度、几何参数，材料性质及地层弹性系数有关。
The Numbers of half wave are related with the length of drill stem, the nature of geometry and material of drill stem and the rock coefficient.
而半波数则与钻柱长度、几何参数，材料性质及地层弹性系数有关。
The Numbers of half wave are related with the length of drill stem, the nature of geometry and material of drill stem and the rock coefficient.
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