单项选择题
A.poor B.bad C.fair D.good
LAND-BASED AUTHORITY CONDUCTING AND CO-ORDINATING SEARC...
单项选择题LAND-BASED AUTHORITY CONDUCTING AND CO-ORDINATING SEARCH AND RESCUE OPERATIONS IN A DESIGNATED AREA defines（）.
A.RCC B.OSC C.CSS D.GPS
When my ship arrived there，their ship（）.A.has left alre...
单项选择题When my ship arrived there，their ship（）.
A.has left already B.left already C.had left already D.would left already
