A:稳定性:HAt>HCl
B:氧化性:At2>I2
C:At2为分子晶体
D:NaAt的水溶液呈碱性
— Can I use your notebook computer this afternoon? ________ is under repair.
— No problem.
如图所示,要使图中平面展开图按虚线折叠成正方体后,相对面上两个数之积为24,则x-2y=____.