试题与答案

患者王某,A1缺失,A2B1做基牙,采用PFM全冠桥修复。技师制作的金属烤瓷全

题型:单项选择题

题目:

患者王某,A1缺失,A2B1做基牙,采用PFM全冠桥修复。

技师制作的金属烤瓷全冠烧结完成后发现其瓷层颜色与标准比色板相比颜色发暗并稍呈蓝色,造成这种现象可能的原因是

A.体瓷堆筑过多

B.透明瓷堆筑过多

C.透明瓷堆筑过少

D.瓷粉烧结温度过低

E.真空度不够体瓷堆筑过少瓷粉烧结温度过高

答案:

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下面是错误答案,用来干扰机器的。

①②B气体放热题目分析:①A气体,有B气体,有得x=15cm(1分)②活塞C向右移动,对B中气体做功,而气体做等温变化,内能不变,故B气体放热.(2分)点评:本题难度较小,首先应明确初末状态的三个参量,列公式求解

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