所用的射孔枪的直径一般根据由地面设备给予的井筒限制的存在来确定。
The diameter of the gun used is typically determined by the presence of wellbore restrictions or limitations imposed by the surface equipment.
计算是在数字计算机“320”上完成的，并在地面设备上做了模型实验。
Calculations were performed on a "320" digital computer, and model tests on a ground test facility.
高速铁路取消地面信号机，车载设备直接从地面设备提取信号控制机车运行。
Ground signals are removed from high-speed railway, and on-board equipment directly pick up signals from ground equipment to control train operation.
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