An order has come the boys in our school should their hair short. A.不填;have B.whether; have C.which; wear D.that; wear 答案:D下列有关阿伏加德罗常数(NA)的说法正确的有( )A.标准状况下,22.4LCO2所含的原子数目约为3NAB.0.1molH2O2催化完全分解(二氧化锰作催化剂),转移电子数为0.1NAC.100mL0.1mol/L的H2SO3溶液中,含有的离子数约为0.03NAD.1molC12发生化学反应,转移的电子数必为2NA