Pentaerythritol ester of gum rosin are made from gum rosin through esterification with pentaerythritol light color stabilizing process etc . used in adhesives , rubber products 松香季戊四醇酯為松香經(jīng)脫色、酯化和穩(wěn)定化等工藝研制而成;應(yīng)用于粘合劑、橡膠行業(yè)。
( 7 ) the operating environment and stabilizing process of the high precision vertical pendulum tiltmeter are studied , corresponding technique demands are brought , and a lot of valuable first - hand record is gained ( 7 )研究了高精度垂直擺傾斜儀的工作環(huán)境和穩(wěn)定過程,提出了相應(yīng)技術(shù)要求,獲得了大量有價(jià)值的原始記錄。