在给定的生产水平下，为另一个消费者提供同一公共物品所带来的边际成本（）零。A.大于 发布时间：2019-08-22 17:16 │ 来源：www.tikuol.com 题型：单项选择题 问题： 在给定的生产水平下，为另一个消费者提供同一公共物品所带来的边际成本（）零。A.大于B.小于C.不能确定D.等于
题型：单项选择题 完形填空。 Mary is 1 American girl. She is now in Beijing with her parents. It's Sunday morning. Mary gets upearly. After breakfast her parents 2 the zoo. They want to see the panda and other animals. The pandalives only 3 . There are 4 pandas in America. 5 they like the panda best. Outside the zoo gate thereis a picture. It's a picture of a panda 6 "welcome". The panda is round and fat. It 7 a ball. It moves like a ball rolling (滚动). The elephant is the biggest ainimal 8 . There are many monkeys on the hill. Someof them are sitting 9 the trees.Some are picking nuts. And 10 are running or climbing up the trees. ( )1.A.an ( )2.A.get her to ( )3.A.in America ( )4.A.no any ( )5.A.So ( )6.A.in ( )7.A.looks ( )8.A.in land ( )9.A.on ( )10.A.the other B.a B.take her to B.in England B.not a B.And B.with B.look like B.on the land B.in B.the others C.the C.take she to C.in China C.any C.But C.on C.looks like C.in the land C.at C.other D./ D.bring her to D.in Canada D.not any D.Because D.at D.looks at D.on land D.for D.some 查看答案
题型：单项选择题 男性，40岁，尿频、尿急、尿痛5年，有时出现肉眼血尿。体检：贫血貌，血尿素氮33mmol，肌酐612mmol，尿常规脓细胞20～30个/HP，B超显示：膀胱容量小，每次排尿50ml。该病不宜检查的项目为（）A.膀胱镜B.尿结核菌培养C.CT检查D.尿培养+药敏E.B超 查看答案