垂直螺旋度的演变对本次西南涡暴雨有较好预报指示意义。
The evolution of vertical helicity has a better forecast instruction significance to the southwest vortex rainstorm.
沙尘暴区上空垂直螺旋度的垂直分布为中高层负值，低层正值。
The distribution of helicity over the sandstorm area was negative at higher levels and positive at lower levels.
主营产品有：螺旋输送机，垂直螺旋输送机，可弯曲螺旋输送机，双螺旋输送机。
Main products are: screw conveyor, vertical screw conveyor, flexible screw conveyor, two-screw conveyor.
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