– Sorry, I don’t know. Maybe it’s in November.
A:What
B:Where
C:When
选词填空。
矗立 挺立 伫立
— In about three days, sir.
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( )