But turning this push into a pull required more sophisticated optics -in Grier's case, a solenoid beam.
但是将这种推力转化为一种拉力需要更加复杂的光学，比如，在格里尔的设计中，是通过一种螺线管状光束。
The protective modules energize and de-energize the solenoid pull coil within approximately 1.5 seconds.
保护模块的活力和德活力螺线管线圈拉在大约1.5秒。
The built-in filter of a solenoid valve can be cleaned without dismantling its sleeve, but simply unscrewing its nut to pull out the plastic filtering plate.
本电磁阀自带的过滤器无需拆卸管子即可非常方便的清洗，只需用手拧下螺帽，拔除塑料滤片即可清洗。
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