【单选题】He doesn't know the city very well, because this is the first time he _____ here. [ ]
【单选题】下列说法不正确的是( )
B.
可降解的有机物一部分被微生物氧化,一部分被微生物合成细胞
D.
BOD是微生物氧化有机物所消耗的氧量与微生物内源呼吸所消耗的氧量之和
【单选题】查看命令sort的帮助文件,可以使用命令( )。
【单选题】Every time he came to me, he tell me he was busy.
【判断题】生物学教学是一个多要素、多层次、多序列的复合、开放、动态的系统工程。
【单选题】下列哪种游览方式不是日本庭院的游览方式( )
【单选题】He started to work dilligently _____ he came up with the idea of hybrid rice for the first time in the 1960’s.
【单选题】_______ the manager came to Beijing on business, he would visit his old friends there. [ ]