燕尾冠型叶片
dovetail crown shaped blade
粗糙元间距
roughness elements spacing
磁道中心间距
track center-to-center spacing
垂标间距
length between perpendiculars
传感器布置极限间距
utmost distance of sensors
处置室间距
space between disposal pits
出入口间距
access spacing
the distance of entrance and exit