A:U1>U2,I1>I2
B:U1<U2,I1>I2
C:U1=U2,I1<I2
D:U1<U2,I1<I2
― My leg is hurt. Can you help me?
― Sorry, I am a vet. I . The doctor help you.
世界卫生组织将某氧化物RO2列为A级高效安全灭菌消毒剂,它在食品保鲜、饮用水消毒等方面有着广泛应用。实验测得该氧化物中R与O的质量比为71:64,则RO2的化学式为()