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【单选题】
2014年马航MH370失联后，曾用“蓝鳍金枪鱼-21”型自主式水下航行器开展搜寻作业，其原理是依靠声呐设备在海底扫描，但一整天只能搜寻相当于一个（）大小的区域。
A.
羽毛球场
B.
篮球场
C.
网球场
D.
足球场
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
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was an unusual problem among astronauts
B.
was what puzzled the early scientists
C.
caused new problems in space flights
D.
drew the attention of the general public
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A.
the variety of food options in space
B.
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C.
the problems of living in the space station
D.
the improvement of food offered in space
【单选题】2014年马航MH370失联后，曾用“蓝鳍金枪鱼-21”型自主式水下航行器开展搜寻作业，其原理是依靠声呐设备在海底扫描，但一整天只能搜寻相当于一个（）大小的区域。
A.
羽毛球场
B.
篮球场
C.
网球场
D.
足球场