折焰角上斜管角度一般在之间。下斜管在20°～30°（）

A.右前斜位30°+向头斜20°~ 30°

B.左前斜位60°+向头斜30°

C.右前斜35°~ 45°

D.左前斜45°~55°

E.足倾斜20°~35°

A.15°～20°

B.25°～30°

C.35°～40°

D.45°～55°

E.55°～65°

A.15°～20°

B.20°～25°

C.25°～30°

D.30°～45°

E.35°～55°

A.10°～15°

B.20°～25°

C.30°～35°

D.45°～55°

E.65°～70°

A.15°～20°

B.25°～30°

C.30°～45°

D.45°～60°

A.20

B.25

C.30

D.28

A.30°

B.45°

C.60°

D.90°

A.20°

B.30°

C.25°

D.15°

E.10°

A.15~20°

B.20~30°

C.30~45°

D.50~55°