请教各位！！
在加载过程中apply pressure on beams的对话框Load keys是什么意思，1，2，3各代表什么意思，我在帮助文件没有找到，谢谢回复：（tangaoming）请教各位！！
<P>When Lab = PRESS, KEY = Load key (face number) associated with a surface pressure load. Load keys (1,2,3, etc.) are listed under "Surface Loads" in the input data tables for each element type in the ANSYS Elements Reference.</P><P>For most other values of Lab, KEY is a coordinate system identification number, CID. The load acts in a direction from (X1, Y1, Z1) to (X2, Y2, Z2) defined by the EDLCS command. If the load is in the global coordinate system, set KEY equal to zero, or leave it blank. Some load types do not support the CID key; see Birth Time, Death Time, and CID Support in the Notes section for more information.</P>
<P>For Lab = PRESS, KEY defaults to 1 when KEY is blank or when KEY = zero. For all other values of Lab, KEY defaults to zero.</P> 呵呵，这点我看到了，但还是不明白1，2，3各代表什么意思？你能用中文告诉我吗，谢谢了
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