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【单选题】
★201.选择不锈钢工具时要有鉴别能力,按材质选择,以( )材质性能最好。A.
13-0
B.
18-0
C.
13-8
D.
18-8
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A.
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B.
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C.
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D.
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A.
relation
B.
contact
C.
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D.
connection
【简答题】计算机硬件有哪些部件,各部件的作用是什么?
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