1) The virus was refractory to the medication. 2) The refractory class was unable to get anything done.
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SiO2 refractory
The relative refractory period is the time during which the generation of an action potential is impossible no matter the strength of the stimulus
refractory Concrete means refractory castable == ==
Because of Changxing Refractory's largest investment, Yilong Refractory was renamed as Changxing Refractrory.
My teacher made an analogy so I could understand the problem at hand.
Use refractory cement.... see above
Refractory Engineers Indianapolis Indiana 3172732000
magnesium-dolomite based refractory
The only change of Yilong Refractory is its name which has changed into Changxing Refractory. Its product quality, pre-sale and after-sale services remain unchanged.
Refractory period
Refractory insulation is defined as insulation for extremely high temperatures. The threshold of temperature of insulation for refractory insulation is > 815 Celsius.
Foundry ladles usually comprise of a mild steel shell with a refractory lining material. Effectively it is the refractory lining material that allows the foundry ladle to be used with molten metal whilst the steel shell provides support for the refractory. Traditionally the refractory material used to be firebrick, fireclay or even rammed sand. However it is more common for foundries to now use special refractory concretes that have high insulation values and last longer. Examples can be seen at www.acetarc.co.uk Where small amounts of metal are to be cast foundries will sometimes use ceramic crucibles to hold the metal.