Lub tsev so yeej ib txwm yog ib qho tseem ceeb ntawm kev tiv thaiv hluav taws, thiab nws yog ib qho tseem ceeb tshwj xeeb los ua txoj haujlwm zoo ntawm kev tiv thaiv hluav taws. Lub qhov rooj tua hluav taws hauv tsev so yuav tsum tau nruab rau ntawm qhov chaw khiav tawm ntawm cov ntaiv, chav faib hluav taws xob, thiab cov kav dej kom zoo. Lub qhov rooj hluav taws hauv tsev so yuav tsum yog qib A, uas yog, steel qib A qhov rooj hluav taws.

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