Atmospheres laden with coal dust or grain dust caused by loading these cargoes ______．A.require loading operations to be shut down until the atmosphere clearsB.are toxic to human lifeC.are subject to spontaneous combustionD.may be explosive in some concentrations
Atmospheres laden with coal dust or grain dust caused by loading these cargoes ______．
A.require loading operations to be shut down until the atmosphere clears
B.are toxic to human life
C.are subject to spontaneous combustion
D.may be explosive in some concentrations
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