A.0.5~4mm B.0.5~2mm C.0.5~1.5mm D.0.5~1.0mm
A.技術(shù)含量低 B.價格經(jīng)濟 C.成功率高 D.適應(yīng)快
A.價格昂貴,利潤高 B.技術(shù)含量高 C.成功率高 D.適應(yīng)快