单项选择题

子程序结束程序用（）指令
A、M03
B、M99
C、M05
D、M98

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不定项选择
‎设R为X上的反自反的和传递的二元关系，则R为反对称的二元关系。‎
A．正确
B．错误
单项选择题
A company provides its product to customers with and without intermediaries. This kind of distribution channel is called _______.
A．direct distribution
B．dual distribution
C．intensive distribution
D．indirect distribution