Each phase angle , whether positive or negative, is referenced to the horizontal.
每个相角不论是正的还是负的，都是相对于水平轴来说的。
This negative pressure phase is of short duration.
负压周期的延续时间很短。
This negative pressure phase is of short duration .
负压周期的延续时间很短。
This negative pressure phase is of short duration .
负压周期的延续时间很短。
应用推荐