...）飞行告警系统HEAT SENSITIVE UNIT 热敏元件CONNECT IN PARALLEL 并联CONNECT IN SERIES 串联NOZZLE 喷咀SPOOL DOWN （发动机）减速 " s!
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Right In the fluid control and shut down and so on, spool orientation is important for the spool valve core and valve.
对于流体的控制和关闭等，阀芯的导向十分重要，阀芯导向用于阀芯和阀座的对中配合。
Right In the fluid control and shut down and so on, spool orientation is important for the spool valve core and valve seat oriented toward the tie.
对于流体的控制和关闭等，阀芯的导向十分重要，阀芯导向用于阀芯和阀座的对中配合。
A toy consisting of a flattened spool wound with string that is spun down from and reeled up to the hand by motions of the wrist.
游游拉线盘， 溜溜球由缠有细绳的扁线盘构成的玩具，通过手腕运动在手上翻转，然后收到手里。
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