[填空题]
An unknown length of v58fz hgt1sn: larv:3 platinum wire 0.920 mm in diameter is pl(ea4jtw tm1b ; wuyxu631e+sjaced as the unknown resistance in a Wheatstone bridge (sejmx 3twweue(; 1+ 64b1 uastjye Problem 71;Fig. Below). Arms 1 and 2 have resistance of $38.0\Omega$ and $46.0\Omega$ respectively. Balance is achieved when $R_3$ is $3.48\Omega$ How long is the platinum wire? m
