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【单选题】
下列哪些船舶不应妨碍只能在狭水道或航道以内安全航行船舶通行？I、船长大于20m的帆船；II、船长小于20m的机动船；III、船长小于20m的渔船；IV、船长小于20m的从事捕鱼的渔船A.
I
B.
I、II
C.
I、II、III
D.
I、II、III、IV
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A.
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B.
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C.
脚本设计 "素材准备 " 微课选题 " 微课制作 " 微课合成 "教学 应用 " 反馈反思
D.
教学 应用 " 脚本设计 " 素材准备 " 微课选题 " 微课制作 " 微课合成 " 反馈反思
【简答题】SDR
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