The trace Rh was concentrated with minified nickel sulfide fire assay before it was determined.
测定之前，痕量铑用小硫化镍试金富集分离。
In 1924, the hall was threatened with destruction when a fire broke out on the roof. A good deal of the wall had to be torn down in an endeavor to trace the source of the fire.
1924年一场大火险些毁掉马萨诸塞堂，为竭力找寻起火源头，大堂墙体的一大部分都不得不被拆除了。
It leaves no trace after fire extinguishing. It replaces for alkylogen annihilator.
灭火后不留痕迹，是取代卤代烷灭火器的替代品。
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