当驾驶员的操纵力仅使调整片偏转而不作用于主操纵面时，称为伺服调整片。
When the pilot's control force acts only to deflect the tab, and not the main surface, it is designated a servo tab.
结果表明，弱界面有阻碍位错运动、偏转主裂纹扩展方向的作用，可形成分层断口。
The results showed that the weak interface can block the motion of the dislocations and change the propagation direction of the main crack, and result in forming lamella fracture surface.
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