Qhov loj ntawm firebricks yog dab tsi?
Rau lub cib ncaj nteg nrog ib tug vertically tuab wedge los yog ib sab tuab wedge, loj A yog sib npaug rau nws thickness c, thiab rau ib tug ncaj cib nteg nrog ib tug vertically dav wedge, loj A yog sib npaug rau nws dav A.
Rau cib tsis ntau tshaj 345 hli ntev, lub thickness ntawm lub cib sib koom δ yog 1 hli, rau cib tsis tsawg tshaj li 380 hli ntev, lub thickness ntawm lub cib sib koom δ yog 2 hli.
