id	keyword
brj-22709	powder
brj-22709	wood
brj-22709	dielectric
brj-22709	wood powder
brj-22709	poplar
brj-22709	content
brj-22709	loss
brj-22709	moisture
brj-22709	frequency
brj-22709	field
brj-22709	fig
brj-22709	constant