A:2,2-二甲基-3-丁烯
B:2,2-二甲基-2-丁烯
C:2,2-二甲基-1-丁烯
D:3,3-二甲基-1-丁烯
Gian Tara is studying Chinese history and culture now. They find them rich and amazing.
如图所示,由不同物质制成的甲、乙两种实心球的体积相等,此时天平平衡.则制成甲、乙两种球的物质密度之比为( )