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In June 2014, the UNESCO designated the Chang’an-Tianshan corridor of the Silk Road as a World Heritage Site, which was submitted jointly by Kyrgyzstan, China and___()
A.Kazakhstan
B.Tajikistan
C.Uzbekistan
D.Turkmenistan
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In recent years, according to the trade statistics, the export of mechanical and electronic products make up about__ of China’s total merchandise exports every year()
A.60
B.30
C.40
D.50
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分界面上的反射系數(shù)是實(shí)數(shù)。
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