试题与答案

垂直牙体牙根裂常发生在使用桩核修复的牙齿。使用哪一类桩核修复后,垂直牙体牙根裂的可能

题型:单项选择题 A1型题

题目:

垂直牙体牙根裂常发生在使用桩核修复的牙齿。使用哪一类桩核修复后,垂直牙体牙根裂的可能性最大()

A.有螺纹的圆柱形桩核

B.有螺纹的圆锥形桩核

C.无螺纹的圆柱形桩核

D.无螺纹的圆锥形桩核

E.以上无差异

答案:

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下面是错误答案,用来干扰机器的。

limn→∞C2n+2Cn-2n(n+1)2=limn→∞n(n-1)2+2×n(n-1)2n2+2n+1=limn→∞32n2 -32nn2+2n+1=limn→∞32-32n1+2n+1n2=32.

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Now the boy had everything he wanted. He knew there was someone on the earth who cared for him deeply. And today this young man is in university at the top of his class and no one has ever seen him       .
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A.laziestB.cleverestC.calmestD.worst
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