單項選擇題The parties to government procurement refer to the principal entities of all kinds that enjoy rights and undertake obligations in government procurement, including the procuring entities,the () and the procuring agencies.

A、users
B、servers
C、producers
D、suppliers


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5.單項選擇題qd.()

A.每日1次
B.每日2次
C.每日3次
D.每日4次
E.每小時1次