单项选择题 实行招投标的工程合同价款应在中标通知书发出之日起内，由发、承包人双方依据招标文件和中标人的投标文件在书面合同中约定。 A、15天 B、30天 C、36天 D、42天

问答题 当截平面垂直于圆锥轴线时，截平面与圆锥相交形成的的交线形状为：

单项选择题 You are caring for a 68-year-oldmale who has copious amounts of fluid in the left pleural cavity due to acute pleurisy. When you exam him as he sitsup in  bed (trunk upright), where wouldthe fluid tend to accumulate? A、   costodiaphragmaticrecess B、costomediastinalrecess C、  cupola D、  hilarreflection E、 middlemediastinum