问题
单项选择题 A1型题
设计半固定桥的主要原因是（）。
A.应力缓冲
B.以便获得共同的就位道
C.美观
D.制作方便
E.价格便宜
答案
参考答案：B
解析：半固定桥的应力缓冲作用现已受到质疑。当桥体受力时，两端基牙受力不如双端固定桥均匀，当基牙受力时，活动端连接的基牙也有可能出现应力集中的现象。
搜题请搜索小程序“爱下问搜题”
设计半固定桥的主要原因是（）。
A.应力缓冲
B.以便获得共同的就位道
C.美观
D.制作方便
E.价格便宜
参考答案：B
解析：半固定桥的应力缓冲作用现已受到质疑。当桥体受力时，两端基牙受力不如双端固定桥均匀，当基牙受力时，活动端连接的基牙也有可能出现应力集中的现象。
Mrs. Ball has a son. His name is Mick. She __1__ him very much and as he is not a __2 __ child, she is always __3__ that he may be ill, __4__ she takes him to see the best __5__ in the town four times a year and the doctor always looks him over__6__. During one of these __7__, the doctor gives Mick all kinds of tests and then says to him, “Do you have any __8__ with your nose or ears these days?” Mick __9__ for a second and then answers, “Yes, I __10__.” Mrs. Ball is very __11__. “But I’m sure you don’t tell me about__12__, Mick!” She says worriedly. “Oh, really?” Says the doctor seriously(严肃地). “And what trouble do you have __13__ your nose and ears, my boy?”“Well,” answers Mick, “I always have trouble with them when I’m _14_ my sweater off, because the _15_ is very tight（紧）.”
|