A.0.2mmB.0.3mmC.0.4mmD.0.5mm
A.愈細(xì)就愈少,愈粗就愈多B.愈細(xì)就愈少,愈粗也要少C.與卡子直徑無關(guān)D.與卡子間距無關(guān)
A.21.6tB.23tC.24tD.27t