A:两烧杯中铜片表面均无气泡产生
B:甲中铜片是正极,乙中铜片是负极
C:甲中铜被氧化,乙中锌被氧化
D:产生气泡的速率甲比乙大
一 Who helped you clean the classroom yesterday?
— ________. I did it all by myself.
下列说法正确的是( )
玫瑰的遗传物质是( )