The stem can be installed in any position, but if a choice of stem positions exists, good practice dictates that the valve be installed with the stem horizontal.
阀杆可以安装在任何位置，但是如果能够选择阀杆位置的话，实践表明将阀杆水平安装在阀门上是最好的方式。
You can expand your circle of friends if you get out and socialize. Be diplomatic but stem when it comes to giving of yourself. Rely on yourself and you will look good to superiors.
如果外出社交，你的社交圈和朋友圈将得到扩展。你的付出应该是有策略但是坚定的。独立自主能让老板对你刮目相看。
When screw pump works, the stem can not only influence by the force of tension stress but also the shearing stress which makes it to be failure easily if the design is not good or monitor is poor.
螺杆泵工作时，杆柱不但受到拉应力，而且受到剪应力。如果设计不当或使用中监测不力，螺杆泵很容易发生故障。
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