TCP must be used when applications need to guarantee that a packet arrives intact, in sequence, and unduplicated.
当应
程式需要保证封包为完整无缺，依序且未经复制的到达，必须
TCP。
TCP must be used when applications need to guarantee that a packet arrives intact, in sequence, and unduplicated.
当应程式需要保证封包为完整无缺，依序且未经复制的到达，必须TCP。
明：以上
句、词性
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