单项选择题


A．involved
B．participated
C．attended
D．employed
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单项选择题
A．definitionsB．identificationC．functionsD．operations
A．definitions
B．identification
C．functions
D．operations
单项选择题
A．preferableB．desirableC．feasibleD．rational
A．preferable
B．desirable
C．feasible
D．rational
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