Mechani cal types of relays are made as open or sealed units;
继电器的机械类型要么是敞开的，要么是密闭的；
Conclusion Mechani-cal ventilation therapy is an effective method in treating neonatal respiratory failure.
结论机械通气是治疗新生儿呼吸衰竭的有效手段。
Conclusion Mechani-cal ventilation therapy is an effective method in treating neonatal respiratory failure.
结论机械通气是治疗新生儿呼吸衰竭的有效手段。
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