[填空题]
In an internal combus- qcytoovkyn:er:* r;bz4* a5sr t yb x /5s:gz s./.i i4n+fbrplsu9cww;;8ution engine, air at atmospheric pressure and a temperature of about 20/ flb.uit4c;psz9r8 sunx w+isrgs/. y bw;5:$^{\circ} $C is compressed in the cylinder by a piston to $\frac{1}{9}$ of its original volume (compression ratio = 9.0). Estimate the temperature of the compressed air, assuming the pressure reaches 40 atm. $^{\circ} $ C