C1 =COMMENT/INPUT,What is the nominal length of this gage ,block (in MM)? , C2 =COMMENT/INPUT,What is the approximate width of the ,gage block (in MM)? C3 =COMMENT/INPUT,A, please enter first constant value(3) , ?+4*L/1000 C4 =COMMENT/INPUT,B, please enter Second constant value(4) , 3+?*L/1000 C5 =COMMENT/INPUT,K,please input third contant(1000) , 3+4*L/? 请教一下，以上这段语句是什么意思？