问题
单项选择题
In which year was the COSPAS-SARSAT system established?（）
A.1980
B.1981
C.1979
D.1982
答案
参考答案：D
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In which year was the COSPAS-SARSAT system established?（）
A.1980
B.1981
C.1979
D.1982
参考答案：D