Sealed batteries are not really sealed because all wet cell batteries have to be vented in order to discharge the build up of pressure during charging .
密封电池并不是真正密封，因为所有的湿电池都必须宣泄，以便履行积聚的压力在收费。
2
By improving parameters of the blasting hole, the charge, charging structure and the priming order etc, the smooth blasting is formed.