单项选择题
（） is very convenient equipment for loading and unloading goods.
A. Crane B. Pallet truck C. Fork lift D. Fork lift truck
单项选择题 The area for unloading goods in warehouse is（）
单项选择题 （）performs two basic functions-marketing and logistics.
单项选择题 （）is the general meaning of the contract, bill, note and proof in the process of logistics.
