单项选择题
（）can be used for carrying goods to the pointed place automatically.
A.Automatic belt B.Automatic conveyor C.Automatic Guided Vehicle D.Robot
单项选择题 （） is to get the materials and services from a company.
单项选择题 What is the most important marker-related factor to the transport cost?（）
单项选择题 What is the most important product-related factor to the transport cost?（）
