单项选择题

牙龈因失去食物的按摩而软弱无力引起牙龈萎缩是由于：　　　

A．、牙冠无凸度
B．、牙冠凸度过大
C．、牙冠凸度过小
D．、牙冠凸度正常
E．、牙冠形态不规则

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二进制数1111 1111对应的十六进制是。（数码间不留空格）

答案： FF

单项选择题

Which of the following expressions are demanding favorable terms of payment? A.
L/C at sight is what we require for all our customers. B.
Would you please tell us the terms of payment? C.
Now let's discuss the question of payment terms. D.
I don't think it is the proper time for us to accept payment by D/P.