A.擦橡皮B.洗版C.水墨平衡D.調(diào)墨
A.無(wú)關(guān)B.有關(guān)C.數(shù)量多成本低D.數(shù)量少成本低
A.滾筒B.輪轉(zhuǎn)C.對(duì)滾D.卷筒