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

燃气效果的好坏关键在于剂的合理选择。

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

专门设计的隔膜式柱塞计量，柱塞的运动行程机械锁定，每次输出量保持恒定。