... surface roughness 表面光洁度 surface safety valve 地面安全阀 surface sample 地面试样；表层岩样 ...
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TANA42F内装式安全阀主要用于铁路和汽车石油液气槽车或地面液气储罐上，起超压安全保护作用。
TANA42F inner assemble safety valve is to be applied to liquefied gas tank lorry in railroad and automobile or ground liquefied gas tank, to provide overpressure protection.
采用双凝固井、变密度固井方式，均采用地面和地下两级安全阀控制；
A cementing method of separable setting and variable density is used, with two level controls of safety valve on the ground and downhole;
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