Most drill ships and barges have a walled opening below the derrick，open to the water’s surface and through which various drilling tools can pass down to the sea floor called a （）.<br>A:moon pool<br>B:spider deck opening<br>C:pontoon<br>D:keyway

Most drill ships and barges have a walled opening below the derrick，open to the water’s surface and through which various drilling tools can pass down to the sea floor called a （）.
A:moon pool
B:spider deck opening
C:pontoon
D:keyway

出自：海船船员证

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