A. 流线短捷 B. 环节最少,避免逆行 C. 流线短捷,环节最少,避免逆行 D. 流线短捷,环节最少,避免逆行,避免交叉
A. were B. could be C. would like D. could not help
A. 汽车修理 B. 服装加工 C. 货物运输 D. 商品零售
A. 正确 B. 错误