A.20 B.30 C.10 D.15
A.K1 B.K2 C.K3 D.K4
A.50pa B.500pa C.300pa D.100pa
A.25－40mm B.10－25mm C.740mm D.＞60mm
A.美观 B.整齐 C.有秩序 D.人身安全
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