This contract shall be written in English and Chinese languages in quadruplicate, both texts being equally authentic, and the Parties hereto shall hold two copies of each text.

1、

Two equations, namely a quadruplicate equation and an iteration equation, are deduced, which are used to determine conver-sion points in the slant interface.

文中导出确定倾斜界面转换点的两个方程，即四次方程和迭代方程；

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2、

As for a sphere reflector on stacked depth section, the apparent depth versus y is a quadruplicate curve.

球界面在叠加深度剖面上，其视深度与y的关系是一条四次曲线。

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3、

The Contract shall be in quadruplicate, with Party A holding three and Party B one, and each copy shall have the same legal force.

本合同一式四份，甲方执三份，乙方执一份，每份具有同等法律效力。

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4、

The Contract is written in quadruplicate ( two for original and copy respectively) which shall become valid on the date of signature.

本合同一式四份（正副本各两份）自签署后生效

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5、

Because it is in mass production, using a rotary drilling fixture, improved production efficiency.

由于是中批量生产，采用了回转式钻床夹具，提高了生产效率。

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6、

Construction technology of rotary drilling machines and impact hammer working together in mollisol area

软土地区旋挖钻机与振动锤联合施工钻孔灌注桩施工工艺

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7、

PLC control technology of rotary drilling rig

旋挖钻机PLC控制技术

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8、

Application of Rotary Drilling Rig in Different Strata of Yongning River Bridge

旋挖钻机在永宁河特大桥不同地层中的应用

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9、

Study on Fluid Velocity at The Hole Bottom in Large Diameter Reverse Circulation Rotary Drilling

大直径反循环回转钻井底冲洗液流速的研究

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10、

The Application of Rotary Drilling to Marine Sedimentary Strata

旋挖钻进工艺在海相沉积地层中的应用

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11、

Combined Application of Steel Casing by Vibrating Hammer and Rotary Drilling Rig

振动锤沉拔钢护筒与旋挖钻机钻进的组合应用

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12、

Application of Rotary Drilling Rig in the Pile Foundation Construction of Huaihe River Bridge

旋挖钻机在淮河特大桥桩基施工中的应用

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13、

Rotary drilling machine: 123 GO!

旋挖钻机：123GO！

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14、

Rotary Drilling Bored Pouring Pile Constructed in Stratum with Difficult Working Condition

在困难地层进行旋挖钻孔灌注桩施工

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15、

On working Evaluation of rotary drilling lines

钻井钢丝绳工作能力的评定

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16、

Technology for continuously controlling inclined well's deviation in the course of rotary drilling

斜井旋转钻进井斜连续控制技术

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17、

Model Analysis on Electro-hydraulic Proportional Control for Rotary Drilling System of Engineering Geological Drilling Rig

钻头轻压慢转钻进地层工程地质钻机回转钻进比例控制系统的模拟分析

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18、

Research on the Bit Structure and Construction Technology of Rotary Drilling in Hard Rock and Gravel

旋挖钻进中硬岩及卵砾层钻头结构及施工工艺研究

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19、

Inclination and Depth Monitoring System for Rotary Drilling Machines

GZX&12型旋挖钻机桅杆倾角及钻进深度监测系统

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20、

Analysis of energy for rotary drilling in weathered granite formation

风化花岗岩地层旋转钻进中的能量分析

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