单选题
AMany ships have two derricks at each hatch.
BMany ships have two winches at each hatch.
CMany ships have two derricks and two winches at each hatch.
DMany ships have two derricks and two winches at each hatch cover.
正确答案
答案解析
略
AMany ships have two derricks at each hatch.
BMany ships have two winches at each hatch.
CMany ships have two derricks and two winches at each hatch.
DMany ships have two derricks and two winches at each hatch cover.