Lub 20A-1 / 20B-1 chains yog ob qho tib si ib hom ntawm cov menyuam saw, thiab lawv sib txawv hauv qhov sib txawv me ntsis.Ntawm lawv, lub nominal suab ntawm 20A-1 saw yog 25.4 hli, txoj kab uas hla ntawm ncej yog 7.95 hli, sab hauv dav yog 7.92 hli, thiab sab nraud dav yog 15.88 hli;thaum lub nominal suab ...
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