题目内容

制备含有共熔成分散剂时，可将共熔成分先共熔，再以其他成分吸收，使其分散均匀。

A. 正确
B. 错误

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Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?（）

A. The source device will only retransmit lost packets on the request of the destination device.
B. The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.
C. The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.
D. The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.
E. If the destination device does not receive a segment, all segments are retransmitted.
F. The source device keeps a record of all segments sent and expects and acknowledgment of each.

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