问题
单项选择题 A1型题
肯氏Ⅳ类缺失，可摘局部义齿设计时将模型向后倾斜，主要原因是 （）
A.制作方便
B.增加卡环固位力
C.牙槽嵴丰满，唇侧倒凹过大
D.使义齿由后向前就位
E.增加义齿前份基托与余留牙间的间隙
答案
参考答案：C
解析：前牙唇侧牙槽嵴倒凹大，模型向后倾斜，以减小唇侧牙槽嵴倒凹，义齿由前向后戴入，且可减小义齿与天然牙的间隙，有利美观。
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肯氏Ⅳ类缺失，可摘局部义齿设计时将模型向后倾斜，主要原因是 （）
A.制作方便
B.增加卡环固位力
C.牙槽嵴丰满，唇侧倒凹过大
D.使义齿由后向前就位
E.增加义齿前份基托与余留牙间的间隙
参考答案：C
解析：前牙唇侧牙槽嵴倒凹大，模型向后倾斜，以减小唇侧牙槽嵴倒凹，义齿由前向后戴入，且可减小义齿与天然牙的间隙，有利美观。
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My father enjoys bike riding.Ever since I was little,I've always loved going biking with my dad.__1__,as I became a teenager,other thins began to draw my__2__.Suddenly,it was important to do things with __3__.I saw my dad every evening at home.Why did I have to__4__my Sundays to allday bike trips with him,too?If my indifference (冷漠) hurt h  im,my father kept__5__,but he would always let me know when he was planning a bike trip__6__I wanted to come. It was a Sunday morning,and I was in low__7__.Two of my friends had gone to the movies without inviting me.Just then my father__8__my room." It's a beautiful day.Want to go for a__9__,today,Beck?" "Leave me alone!"I impatiently__10__. Those were the last words I said to him before he left the house that__11__. Several hours later,the police called us,__12__us that Dad had a traffic accident.My father's injuries were serious.It took several days before he could__13__speak.Beside his bed I eldhishandgently__14__ of hurting him. "Daddy...I'm sorry...""It's okay,sweetheart.I'll be okay." "No," I said,"I__15__what I said to you that day.You know,that morning?" "Sweetheart,I don't__16__anything about that day.I remember kissing you goodnight the night before, though." He__17__a weak smile. I felt regretful for my thoughtless remark,for I__18__,wanted him to leave me alone.My teacher once told me that__19__have immeasurable power.They can hurt or they can heal.And we all have the__20__to choose our words.I intend to do that very carefully from now on. | |||
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