单选题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 poolBspider deck openingCpontoonDkeyway
单选题
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
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