5吨的15是：5×15=1（吨）；
3吨的13是：3×13=1（吨），
所以一样重．
故答案为：正确．
________ that's important is that you are doing your best and moving in the right
direction.
A．One
B．All
C．Everything
D．Anything
护层是电缆外层的（）部分。
