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【单选题】
图中2所指的表面结构要求Ra的上限值是：【图片】
A.
none
B.
1.6 μ m
C.
3.2 μ m
D.
25 μ m
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【单选题】Nowhere else in Europe ________ people who invite complete strangers to their homes for coffee or dinner. [     ]
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【多选题】下列关于税款的退还和追征制度的陈述，正确的选项有( )。
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