A.公稱(chēng)外徑 B.公稱(chēng)壁厚 C.公稱(chēng)內(nèi)徑 D.標(biāo)準(zhǔn)尺寸比
A.0.02 B.0.04 C.0.2 D.0.4
A.0.2%;0.2% B.2%;2% C.10%;10% D.14%;14%