问题
单项选择题
The identification character of each Navtex station is regarded as（）to the messages.
A.the only preamble
B.a part of the preamble
C.the closing
D.the suspension
答案
参考答案：B
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The identification character of each Navtex station is regarded as（）to the messages.
A.the only preamble
B.a part of the preamble
C.the closing
D.the suspension
参考答案：B