问题
单项选择题
The line connecting the Loran-C master station with a secondary station is called the（）.
A.Focus line
B.Base line
C.Side line
D.Center line
答案
参考答案：B
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The line connecting the Loran-C master station with a secondary station is called the（）.
A.Focus line
B.Base line
C.Side line
D.Center line
参考答案：B