THE POOR QUALITY OF PAPER WAS CAUSED BY ________A. PRESENCE OF LIG...
31. The poor quality of paper was caused by ________
A. Presence of lignin in wood pulp
B. Lack of lignin in wood pulp
C. Wood pulp
D. Being kept for centuries
31. The poor quality of paper was caused by ________
A. Presence of lignin in wood pulp
B. Lack of lignin in wood pulp
C. Wood pulp
D. Being kept for centuries