-----Do you know how long the diameter of the Mars?

-----It’s didmeter is 53%_____that of the earth?

A．as soon as

B．as well as

C．as wide as

D．as much as

前牙的根管工作长度是指（）。

A.牙实际长度

B.牙根管长度

C.开髓口到根尖端的长度

D.切端到根尖狭窄部的长度

E.X线片上的牙齿长度