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【单选题】
下列动物的行为中,属于先天性行为的是( )A.
蚯蚓走T型迷宫
B.
大山雀偷饮牛奶
C.
母鸡抱窝
D.
海豚表演
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【单选题】Passage 2 Without proper planning, tourism can cause problems. For ex ample, too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too muc...
A.
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B.
Building roads and hotels is essential
C.
Support facilities are highly necessary
D.
Planning is of great importance to tourism
【简答题】Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places that are also enjoyed by the inhabitants居民of a country. If tourists create too much traffic,...
【简答题】请参看章节材料4.2中《ZEMAX实例教程》中“课程2:双透镜”,重复该内容, 给出结果,包含结构数据截图,2D结构图、像差特性图、光程差曲线图、点列图、焦点色位移曲线 和 场曲畸变曲线,每幅图适当给出简单的说明。 另外请在结果前写一段话说明,包含结构类型,焦距,方法等
【简答题】Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too much traffic, ...
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