单选题Atmospheres laden with coal dust or grain dust caused by loading these cargoes（）.Arequire loading operations to be shut down until the atmosphere clearsBare toxic to human lifeCare subject to spontaneous combustionDmay be explosive in some concentrations
单选题
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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