关于拔牙体位，术者位于患者的右后方时适于拔除的牙位是（）
A.上前牙
B.下前牙
C.上后牙
D.下后牙
E.下颌阻生智齿
参考答案：B
补全对话，每空一词。
A: Look at the picture!
B: Oh, it's nice picture of a __1__. Is it your family, John?
A: Yes, it is. Can you see me in this picture?
B: Is the boy __2__ red you?
A: Yes, he is.
B: __3__ is the old man?
A: He's my grandfather.
B: And this old woman.
A: She's my __4__.
B: Is this your father?
A: No, __5__ isn't. He is my uncle. The man beside (在……旁边) my uncle is my __6__.
B: Who is the woman beside your father?
A: Oh, she is my __7__.
B: Your mother is very beautiful (漂亮的).
A: __8__ you very much!
B: Is the __9__ your sister?
A: No, she isn't She is my uncle's __10__.
B: I see. She is your cousin. You have a nice family.
A: Thank you!
如图所示，物体A和B所受重力都为120N，滑轮重力不计。当分别用力匀速提升物体A和B时，FA=__________N，FB=__________ N。
