A. Suffrage and election. B. Checks and balances. C. The two politics to limit power and to control power. D. The dividing of functions among many entities. 参考答案:C 答案解析:第十三段Jefferson believed that the best practice for the avoidance of tyranny and the preservation of f
第13题: [单项选择]制备嵌体窝洞时,与修复体边缘封闭直接有关的是 A. 洞斜面 B. 边缘嵴 C. 轴面角 D. 洞的线角 E. 洞的深度 参考答案:A 答案解析:[解析] 一般在洞缘牙釉质内预备出45度斜面,斜面宽约1.5mm,并可根据[*]面情况对斜面深度和角度作适当调整,斜面预备的目的是:去除洞缘无基釉,防止釉质折断;增加嵌体的洞缘密合性与封闭作用,防止黏