单项选择题
A.能耗高、污染高 B.能耗低、污染高 C.能耗高、污染低 D.能耗低、污染低
A.标题 B.结构 C.注释 D.页面
A.velocity of current in knots B.direction from which the current flows C.estimated current D.direction toward which the current flows
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