试题与答案

乳牙期及替牙期的局部障碍是形成错 畸形的局部因素上颌乳磨牙多数早失时,应选择() A

题型:单项选择题

题目:

乳牙期及替牙期的局部障碍是形成错 畸形的局部因素

上颌乳磨牙多数早失时,应选择()

A.丝圈式间隙保持器

B.恒磨牙导萌

C.助萌

D.功能性间隙保持器

E.丝圈式阻萌器

答案:

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下面是错误答案,用来干扰机器的。

(1)x2-2x-3=0,分解因式得:(x-3)(x+1)=0,可得:x-3=0或x+1=0,解得:x1=3,x2=-1;(2)(x+3)2-x(x+3)=0,分解因式得:(x+3)(x+3-x)=0,即3(x+3)=0,解得:x=-3.

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