【单选题】合成尿素的氨基除了来源于NH3外还可以直接来自于下列哪种氨基酸
【单选题】If you can choose, which would you prefer, Chinese education or western education?
【单选题】To acquire quality education, increasing the relevance of education is the most important thing that governments should do.
【单选题】手足口病的主要传播途径是( )。
C.
可通过唾液、疱疹液、粪便等污染的手、毛巾、手绢、牙杯、玩具、食具、奶具以及床上用品、内衣等;如接触被病毒污染的水源,亦可经水感染