What is the standard unit for measuring the size of checked baggage？

What is the standard unit for measuring the size of checked baggage？
A.Centimeters.
B.Inches.
C.Meters.
D.Feet.
正确答案：A
试题解析：在航空领域，通常使用厘米作为测量托运行李尺寸的标准单位，这样能更精确地衡量行李大小是否符合规定。