cad加载块操作命令，BU 图块重命名

BU2 : 图块单独重命名

CB: 土块替换

but: 图块基点变化 (注意拷贝图纸很容易出现同名块，图形会混乱，最后更改块名) Stxt:字转属性字

ttxt:属性字转字

Ulockb: 转换“多重插入块”为“普通块”,用于不可炸开块 lockb: 转换“普通块”为“多重插入块”,用于锁定图块

ktj :块统计

-cad block loading command, BU tiles rename

BU2: Rename individual tiles

CB: Replace clods

but: tile basis points change (note that copies of the drawings is prone to block the same name, the graphics will be confused, and finally change the block name) Stxt: Word word transfer property

 　ttxt: property transfer word word

Ulockb: Convert　multiple insert blocks　for the　normal block　for non-blasted block lockb: Conversion　normal block　to　multiple insert block　for locking tiles

ktj: Block Statistics