常見例句雙語例句Methods The vacuum negative pressure meter and the delayed control line were used.方法：用真空負(fù)壓表、延遲控制線路，接通電話機(jī)免提鍵、存儲撥號鍵。On the working spot of centrifugal water pump, the detection can be carried out only by fixing the negative pressure translator in the original position of vacuum meter .在離心式水泵工作現(xiàn)場只須把原安裝真空表的位置換上負(fù)壓變送器即可進(jìn)行檢測。First close the plug of a vacuum or pressure meter, if so mounted on the pump, connected to the pump before starting the motor and then open it when the motor move in the normal speed;如果泵上裝有真空表或壓力表，要關(guān)閉其與泵相連接的旋塞再啟動(dòng)電動(dòng)機(jī)，待轉(zhuǎn)速正常后再打開； 返回 pressure vacuum meter