单项选择题


A．definitions
B．identification
C．functions
D．operations
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单项选择题
A．preferableB．desirableC．feasibleD．rational
A．preferable
B．desirable
C．feasible
D．rational
单项选择题
A．BasicallyB．GenerallyC．PrimarilyD．Frankly
A．Basically
B．Generally
C．Primarily
D．Frankly
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