口腔黏膜疾病中,其重型表现为毒性表皮坏死松解综合征(Lyell综合征)的是() ["口腔黏膜感染性疾病","口腔黏膜溃疡类疾病","口腔黏膜大疱类疾病","口腔黏膜斑纹类疾病","口腔黏膜超敏反应性疾病"]
与影响X线质的因素无关的是()。 ["管电压峰值","管电压波形","管电流值","X线管的固有滤过","附加滤过"]
急性胆囊炎伴有结石的百分率为() ["50%~60%","70%~80%","90%~95%","60%~70%","80%~90%"]
药物过敏性口炎属于() ["Ⅰ型变态反应","Ⅱ型变态反应","Ⅲ型变态反应","Ⅳ型变态反应","自身免疫性疾病"]
全国土地利用总体规划纲要
设AS曲线方程为ys=500,AD曲线方程为yD=600-50P。
(1)求供求均衡点。
(2)如果AD上升10%,求新的供求均衡点。