... pressure armor 耐压钢铠 pressure attenuation 压力衰减 pressure balance work over rig 不压井修井机 ...
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The peak pressure attenuation of shock in water in borehole axis direction was slower than the direction vertical to the borehole axis.
水中冲击波压力峰值在炮孔轴线上衰减比垂直于炮孔轴线向上衰减慢。
The experiment showed that in the melon slices there were some points where the sound pressure attenuation coefficient were negative value or zero.
实验表明额隆内有若干点声衰减为负值及零值、意味着声波沿这些点传输时、声压非但不减小反而增大了。
An exploration of axle centre pressure attenuation rule proves that the effective injection distance is 9~15 times as much as the diameter of nozzle entry.
对轴心压力衰减规律的探索，证明其有效喷距为喷嘴入口直径的9～15倍；
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