A.20°-30° B.30°-45° C.45°-60° D.60°-90° E.≥90°
A.2h;20-30ml B.3h;20-30ml C.4h;20-30ml D.2h;30-50ml E.4h;30-50ml
A.25° B.30° C.45° D.60° E.90°