α,1,β成等差数列,而
成等比数列,则
的值为( )
参考答案:B
解析: 由[*]成等比数列得[*]有αβ=1或者-1,由α,1,β成等差数列得α+β=2;则[*]或者-3。
_______ this sentence a second time, the meaning will become clear to you.
A.If reading
B.When you read
C.Reading
D.Read
甲状旁腺代偿功能增强出现于()
A.高血钙时
B.佝偻病活动期
C.佝偻病后遗症期
D.维生素D中毒时
E.维生素D缺乏性手足抽搐症