[填空题]
Calculate the bond length for the/ pn(.rk n ymfjn)61x:ev ( cg30sctrw NaCl molecule given that three sucj z3 mw5 gjef*5do7g58qpomt8cessive wavelength58zfo 5edj7gmw5tg jmqo38 *ps for rotational transitions are 23.1 mm, 11.6 mm, and 7.71 mm. $r = $ $\times 10^{-10}\ \text{m}$
