【单选题】在治涝标准研究中,一般应以涝区发生一定重现期的暴雨时不受涝为准,城市建成区设计暴雨重现期一般采用______,天然下垫面为主的产流区设计暴雨重现期采用______
【简答题】4860是45的______倍,522里面有______个87.
【单选题】在治涝标准研究中,一般应以涝区发生一定重现期的暴雨时不受涝为准,城市建成区设计暴雨重现期一般采用______,天然下垫面为主的产流区设计暴雨重现期采用______。
【单选题】—What would you like for _____ breakfast, Mr. White? —Three pieces of bread wit h _____ cup of black tea, please. [ ]
【判断题】____传染病是在一定环境条件下由病原微生物与机体相互作用所引起的,耐过动物能获得非特异性免疫。P40
【简答题】完形填空。 Mr Black works in a hospital. As a good 1 , the people in the town like him. He's of-ten 2 to the patients and looks them over carefully._ 3 he's always busy and has littletime to rest. One morn...
【多选题】传染病的特征有()
A.
是在一定环境条件下由病原微生物和集体相互作用所引起的