This cab signaling device is fail - safe and has highly reliability and - interference .数字化双制式机车信号符合故障 - 安全原则,可靠性高, 抗干扰能力强.It is becoming accepted practice that jet aircraft must " fail safe " .喷气式飞机必须有故障 安全装置,这已经逐渐成为公认的...
The fluid can be drawn off with a syringe.可用注射器将液体汲出。To suction with a bulb syringe, push bulb in with your thumb.用球吸引器时先用拇指把球压扁.A bulb syringe is often used for oral and nasal suction on infants and children.常常使用球吸引器抽吸婴...
另外的一只青蛙仍在奋力地向上跳着.The other frog continued to jump as hard as he could.那篮球选手垂直地向上跳且抓住那球.The basketball player jump up perpendicularly and grab the ball....