单项选择题
A.100×25 B.100×50 C.125×50 D.125×25
A.5 B.120 C.168 D.180
A.60±5 B.55±5 C.75±5 D.65±5
A.横纵各2 B.横纵各3 C.纵向4 D.横向4
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