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【单选题】
凸轮机构中从动件的运动规律取决于( )A.
凸轮轮廓的大小
B.
凸轮轮廓曲线的形状
C.
基圆的大小
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举一反三
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【单选题】What is the key map-reading concept?
A.
You have to remember all the symbols on the map.
B.
A map is a piece of paper standing for the real world.
C.
Map-reading is like playing a toy.
D.
A star can show where a capital is.
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【单选题】What information can she have in the map?
A.
She will arrive in Sydney
B.
She will plan to go to Australia with her sister.
C.
She will go to the airport by taxi.
D.
She can get all information she needs for the city tour.
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