铸造支托的长度为
A磨牙近远中径的1/4,双尖牙近远中径的1/2
B磨牙近远中径的1/4,双尖牙近远中径的1/3
C磨牙近远中径的1/3,双尖牙近远中径的1/2
D磨牙近远中径的1/3,双尖牙近远中径的1/3
E磨牙近远中径的1/2,双尖牙近远中径的1/2
A磨牙近远中径的1/4,双尖牙近远中径的1/2
B磨牙近远中径的1/4,双尖牙近远中径的1/3
C磨牙近远中径的1/3,双尖牙近远中径的1/2
D磨牙近远中径的1/3,双尖牙近远中径的1/3
E磨牙近远中径的1/2,双尖牙近远中径的1/2