A:Because she was a few minutes late
B:Owing to a few minutes late
C:The fact that she was a few minutes late
D:Being a few minutes late
在“探究什么情况下磁可以生电”的实验中,连接了如图所示的实验装置.
已知某元素R的化合价为+3价,其氧化物的相对分子质量为160,问: