[填空题]
The wiring in a house must be thick enough so it does not become so hot*bvc t(xw )s ezh1:u/ z40tuxr as to 9*v0b a *j8ptsjc3dfistart a fire. What diameter mus8j9bidj 3at* pvc s0f*t a copper wire be if it is to carry a maximum current of 35 A and produce no more than 1.8 W of heat per meter of length? $ \times10^{ -3}\;m$
