示例： 替换用户定义的特征
INPUT
GROUP STRING
"ENTER GROUP TO PLACE 300/352/409"
END INPUT
CHOOSE (GROUP)
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• 要使用 CHOOSE 语句，必须首先手动替换该组的族表实例或用另一组替换该组。
• CHOOSE 语句不能包括在条件语句中。
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组前导字符中的 ADD 语句可以为以下格式：
ADD FEATURE (initial number 4)
INTERNAL FEATURE ID 300
PARENTS = 33(#1)
TYPE = PROTRUSION
FORM = EXTRUDED
SECTION NAME = S2D0002
DEPTH = FROM SKETCH TO BLIND
FEATURE’S DIMENSIONS:
d44 (d23) = 2.00
d45 (d24) = 1.00
d46 (d25) = 1.00
d47 (d26) = 2.00
d48 (d27) = 1.00
MEMBER OF A GROUP, NAME = RECT
LEADING FEATURE OF THE GROUP: ID = 303
LAST FEATURE OF THE GROUP: ID = 303
GROUP IS REPLACEABLE BY FEATURES ID (NAME):
409(round) and 352 (circular)
END ADD