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 （）.
- Amoon pool
- Bspider deck opening
- Cpontoon
- Dkeyway
问题
Most drill ships and barges have a wal
参考解析：
分类：海洋法基本知识题库
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