When the higher power arc is of the submerged arc type, the flux powder covering the weld metal pool must also be supported against the effects of gravity.
当高功率的弧是埋弧类型，通量粉末覆盖焊缝金属池还必须支持对重力的影响。
Automatic water sluice gate is under the waterpower and action of gravity, in the given water height condition; and it start and stop automatically as the flux change.
水力自控闸门是借助水力和重力作用，在一定的水位条件下，随流量的变化，自动启闭的自动化闸门。
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