Grasp upper and lower stem lock nut with wrench and loosen.
用扳手抓住上部和下部阀杆锁紧螺母并且松开。
The lower stem is physically pulled away from the seat instead of being lifted away by the spring.
下阀杆是被从阀座上物理地推开，而不是被弹簧举起来。
When the upper stem rides up and down on its threads it now moves the lower stem by a mechanical connection.
当上阀杆沿着它的螺纹上下运动时，通过机械连接带着下阀杆一起运动。
SOD and POD activity descended apparently, and chlorophyll contents and photosynthesis declined in senescent leaves of lower stem.
主茎下部衰老叶片的SOD、POD活性明显降低、叶绿素含量减少、光合作用功能衰退。
In rice (Oryza sativa), the shoot-borne crown roots are the major root type and are initiated at lower stem nodes as part of normal plant development.
水稻地上部形成的冠状根主要是在低位茎节上长出的根，是植物正常发育一部分。
In rice (Oryza sativa), the shoot-borne crown roots are the major root type and are initiated at lower stem nodes as part of normal plant development.
水稻地上部形成的冠状根主要是在低位茎节上长出的根，是植物正常发育一部分。
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