The key point of the odorization efficiency is the proper selection and utilization of the odorant.

燃气臭效果关键在于臭剂合理选择与使用。

Odorization pumps are specially designed diaphragm plunger metering pump, plunger travel of the exercise machine lock, each time to maintain a constant output.

臭是专门设计隔膜式计量，运动行程机械锁定，每次输出量保持恒定。