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【单选题】
Why did the U.S. Navy set up underwater microphones around the world in the 1960s?A.
To listen for changes in ocean structure.
B.
To listen for changes of ocean currents or volcanic activity.
C.
To make sure whether there was a giant squid deep in the ocean.
D.
To follow the track of the Soviet warships under water.
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A.
标准工具箱提供的控件是对象类
B.
Visual Basic 6.0程序可以不从窗体启动
C.
一个工程中可以包含多个窗体文件
D.
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A.
198V
B.
148.5V
C.
99V
D.
49.5V
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A.
checked in
B.
dropped in
C.
checked out
D.
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