视需要旋转并将真空引动器倾斜以放松循环空气门连杆末端上的勾销放松引动器连接末端上的孔。
Rotate and tilt the vacuum actuator as required to disengage the hole on the end of the actuator link from the hooked pin on the end of the recirculation air door lever.
因为沉积作用可能出现于倾斜面上，所以视厚度或所量测的层厚可以与真实的层厚度不同。
Because sediment deposition can occur on inclined surfaces, apparent or measured bed thickness might differ from true bed thickness.
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