聲h cong lớn( C: 8.5cm R: 37.5cm)
聲h cong trung( C: 10cm R: 23cm)
聲h cong nhỏ( C: 5cm D: 24cm R: 5cm)
聲h thẳng PLT( C: 6.5cm D: 26cm R: 5.5cm)
聲h thẳng( C: 5.5cm D: 18cm R: 4.2)
