A.work to explain real, rather than theoretical or simplified situations
B.know that well-defined problems are often the most difficult to solve
C.are unable to express their data in terms of multiple variables
D.are unwilling to relax the axioms they have developed
第9题
正气已虚,余邪未尽,因正气难复,致病处缠绵难愈的病理过程,属于
A.邪正相持
B.正虚邪恋
C.正胜邪退
D.正胜邪退
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