第4题: [单项选择]患者,女,30岁,右下7牙体缺损拟行冠修复,牙体预备后常规制取印模,在用石膏灌注工作模型时,以下做法正确的是() A. 石膏粉与水调和后,发现水量过多,再次加入石膏粉继续调拌 B. 灌注模型时从右侧逐渐到左侧 C. 灌注时避免振荡 D. 组织面最好选用熟石膏 E. 模型在灌注后15分钟不可修整,24小时则容易修整 参考答案:B 答案解析:石膏粉与水调和后,若发现水粉比例不合适,应重取量调和。此时再加入石膏粉或水,会造成结晶中心反应的时间和数量不一致,形成晶体间凝聚力减少的不均匀块状物,使凝固时间不同步,导致石膏强度降低。灌注模型时应从
第9题: [单项选择]Hydrocarbons, ______ by engine exhausts, react with nitrogen oxides in the presence of sunlight to form complex toxic gases. A. are given off B. give off C. they are given off D. given off 参考答案:D
第18题: [单项选择]— How's the movie? Interesting? —() A. I was seated far away in the corner B. Far from. I should have stayed home watching TV C. It was shown late until midnight 参考答案:B
第28题: [简答题]SectionB
Directions:In this part there are five sentences in Chinese.You should translate them into English.Be sure to write clearly.他一到上海就给我打了一个长途电话。 参考答案:He gave me a long-distance calls upon his arrival at Shanghai.
第31题: [单项选择]下牙列缺失后,下颌骨改变规律中,正确的是 A. 颌弓前段向下、向前吸收 B. 颌弓后段向上、向外吸收 C. 下颌弓逐渐变小 D. 牙槽嵴变低、变宽 E. 腭穹隆显低、浅 参考答案:A 答案解析:[解析] 下牙列缺失后,下颌骨改变规律是:下颌牙槽骨舌侧骨板较唇颊侧薄而疏松,吸收快而多。牙槽骨顺牙根方向吸收,在颌弓前段向下、向前,在颌弓后段向下、向外吸收。此答案中,只有A叙述正确,故选A。