短语词组短语gas -freeing of tanks 排除储罐中油品的蒸气windsail gas -freeing 风筒驱除油气法;帆布风筒消除油气法suction fan gas -freeing 抽风驱除油气法ejector gas -freeing system 蒸汽喷射油气抽除装置 返回 gas freeing