题目详情
单选题 The group keystrokes or characters in choice ______ is sent as part of ARQ communications to signal the end of the text
A. four "N" s, i.e. "NNNN"
B. "BRK+"
C. four "Q" s, i.e. "QQQQ"
D. five periods (".....")

学科:GMDSS 英语
时间:2023-11-06 00:29:18
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