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【单选题】
IS0为运输层定义了四种类型的服务原语，由运输层服务用户生成的原语是（ ）A.
请求原语、确认原语
B.
指示原语、响应原语
C.
指示原语、确认原语 &&
D.
请求原语、响应原语
拍照语音搜题，微信中搜索"皮皮学"使用
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