一辆磁悬浮列车的时速是225千米,相当于普通汽车时速的2.5倍。普通汽车每小时行驶多少千米?
设:普通汽车每小时行驶x千米
2.5x=225
x=90
You should consider carefully the car you want to buy is worth the money.
A.that
B.which
C.whether
D.what
划分煤种的指标主要有()和()。