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

燃气好坏关键在于剂合理选择与使用。

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

泵是专门设计隔膜式柱塞计量泵，柱塞行程机械锁定，每次输出量保持恒定。