The concentrations of N and S in Sabina chinensis leaf were higher along urban trunk roads and belthighway than at reference site, while those along suburban roads were similar to the reference.
城市干线和绕城公路蜀桧叶片中的N和S含量高于对照点,而城郊公路则接近对照。
2
The combined highway guard rail board can be used in a narrow central separation belt.
组合高速公路护栏板可在窄中央分隔带上使用。
3
The drainage design of urban highway deals with only the surface run-off. It presents a new drainage system considering the road surface, pavement structure, and subgrade (including green belt).