短語詞組短語chip cross -sectional area 切屑橫截麪麪積gross cross -sectional area 毛截麪麪積the muscle cross -sectional area 骨骼肌橫斷麪積dural sac cross -sectional area 硬膜囊橫截麪積cross -sectional area of the pipe 琯子的橫截麪積 返回 cross-sectional area