三聚氰酸[C3N3(OH)3]可用于消除汽车尾气中的NO2,其反应原理为: C3N3(OH)3 3HNCO; 8HNCO+6NO2 7N2+8CO2+4H2O 下列说法正确的是 A.C3N3(OH)3与HNCO为同一物质 B.HNCO是一种很强的氧化剂 C.1 molNO2在反应中转移的电子为4mol D.反应中NO2是还原剂 答案:CTraditionally,college students hold a graduation ceremony to encourage themselves before they________on their life journey. (2013·安徽,26)A.give up B.settle down C.get through D.set off