免疫荧光法具有重要诊断价值的疾病是 ["A．复发性阿弗他溃疡","B．单纯疱疹","C．天疱疮和类天疱疮","D．带状疱疹"]
原发性疱疹性口炎最多见的年龄段是 ["A．4～6个月","B．6个月～2岁","C．6岁以下","D．20～50岁"]
为表达祝福，下面哪一种方式更符合环保？（） ["寄贺卡","买精美包装的高档礼品","发E—mail"]
附着水平的距离，是指 ["A．龈缘至釉牙骨质界","B．釉牙骨质界至袋底","C．龈缘至袋底","D．袋深度+龈缘至釉牙骨质界"]
X线片上判断有无牙槽骨吸收的标准是 ["A．牙槽嵴顶与釉牙骨质界平齐","B．牙槽嵴顶到釉牙骨质界的距离>2mm","C．牙槽嵴顶到釉牙骨质界的距离>3mm","D．牙槽嵴顶到釉牙骨质界的距离<2mm"]
什么是“经济截面”？如何按经济电流密度来选择导线和电缆截面？
