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although the united states has produced most commercial films in the 20th century, movies did not originate in america. ()

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8086中的通用寄存器CX又称为累加器。()

和铝合金材料直接接触的紧固件应使用()
A﹑碳素钢
B﹑表面热镀锌处理的碳素钢
C﹑轻金属
D﹑不锈钢

one of the distinctive features about the british class system is that it has also retained a hereditary aristocracy. ()

混凝土强度合格评定有()方法.
A﹑一种
B﹑二种
C﹑三种
D﹑四种