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【单选题】
91· 船舶主机换向,从前进三到后退三约需时间为( )。A.
蒸汽机船60～90s，汽轮机船90～120s，内燃机船120～180s
B.
内燃机船60～90s，蒸汽机船90～120s，汽轮机船120～180s
C.
汽轮机船60～90s，蒸汽机船120～180s，内燃机船90～120s
D.
蒸汽机船60～90s，内燃机船90～120s，汽轮机船120～180s
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