Almost every Z series of trains is equipped with soft sleeper, softseat, hard sleeper and hard seat.
几乎所有的Z系列列车都设有软卧、软座、硬卧和硬座。
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Comments: When using diaphragm valves or any valve with a softseat material in a service where corrosion products can be produced, it is very important to take precautions to prevent those reactions.