Allan cut the big birthday cake _____ small pieces. [ ]
A. as
B. to
C. into
D. in
答案:C
女性,24岁,1天来发热、腰痛、尿急、尿频来院。以往无类似发作史。查肾区有叩击痛。此时对诊断有帮助的辅助检查应是
A.中段尿培养和药敏试验B.双肾B超C.排泄性尿路造影D.尿浓缩试验(改良莫氏法)E.核素肾图
离心式压缩机是如何提高气体压力的?