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问题 单项选择题

患者，男，55岁，主诉左下后牙嵌塞食物，有时遇冷热刺激敏感。查见深龋，去腐后未见穿髓，拟作成远中洞充填，修复时邻面部分应设计的主要同位形是

A．侧壁固位
B．牙本质钉固位
C．倒凹固位
D．梯形固位
E．鸠尾固位

答案

参考答案：D

单项选择题


The figure above represents a rectangular parking lot that is 30 meters by 40 meters and an attached semicircular driveway that has an outer radius of 20 meters and an inner radius of 10 meters. If the shaded region is not included, what is the area, in square meters, of the lot and driveway
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判断题

天然气比空气轻，一旦泄漏向大气逸散，危险性小（）
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