问题
单项选择题
The receiving stations can use the B2 character to（）different, classes of messages.
A.identify
B.Correct
C.Reject
D.Print out
答案
参考答案：A
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The receiving stations can use the B2 character to（）different, classes of messages.
A.identify
B.Correct
C.Reject
D.Print out
参考答案：A