The gas box is provided with a gascharging device, a safety device and an accessory fixing device.
气箱装有充气装置、安全装置和附件固定装置。
2
Besides, gascharging device could be used to inspect pressure, but gas will be discharged a bit during each inspection.
此外，还可以利用充气工具检查压力，但每检查一次都会放掉一点气体。
3
It provided a safety pressure controlling method in the condition of continuously gas injection of parasitical pipe (temporary casing) gascharging approach.