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45 . 0 , 2, 10, 30, ()A .68 B .74 C .60 D .70
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:0 , 2, 10, 30, ()A.68 B.74 C.60 D.70
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0,2,10,30,() A.68B.74C.60D.70
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0 , 2, 10, 30, () A .68 B .74 C .60 D .70
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45 . 0 , 2, 10, 30, ()A .68 B .74 C .60 D .70
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安全平网的外口要高于里口()厘米。A、30-40B、40-50C、50-60D、60-70
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0 2 10 30 ( ) A.68B.74C.60D.70