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【判断题】
大多数高速发动机采用一个气门装有同心内、外两根气门弹簧的方法,不但可防止气门弹簧共振,而且当一根弹簧折断时,另一根仍可继续工作,防止气门落入气缸顶坏活塞,也降低了气门弹簧的整体高度。两根弹簧螺旋方向相反,以防折断的弹簧卡入另一簧内。A.
正确
B.
错误
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