[仪] 定压降式流量计 pressure flowmeter: 压流计drop in pressure: 压力降低; 压力下降drop of pressure: 压降; 压力降pressure drop: 压降; 压力降;压差(损失); 压力损失; 压力下降difference pressure piping for flowmeter: 流量计用差压管下载手机词典可随时随地查词查翻译