单选题The COSPAS-SARSAT 406MHZ system was adopted as an element of the GMDSS by IMO in（）.A1992B1980C1984D1988
单选题
The COSPAS-SARSAT 406MHZ system was adopted as an element of the GMDSS by IMO in（）.
A
1992
B
1980
C
1984
D
1988
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