已知Cn=2n+3n,常数P使{CN+1-PCn}为等比数列,则P=( ).
A.(2
B.(3
C.(2或3
D.(6
E.(A、B、C、D都不正确
参考答案:C
解析:
—Do you think there are too many new words in this unit ?
—Yes, that’s right. I’ll first. [ ]
A. look it up
B. look up them
C. look them up
D. look for them
全口义齿试戴前在咬合架上检查时,可不考虑()
A.人工牙的咬合关系
B.颌位关系是否正确
C.基托边缘伸展位置
D.基托的稳定性
E.人工牙的排列位置