太湖流域全面推行河长制,为强化河湖监督性监测,力争对流域片列入全国重要饮用水水源地名录的()个水源地开展水质全指标监测。
A.29
B.39
C.45
D.49
参考答案:B
简述经验异戊二烯法则和生源异戊二烯法则的区别。
A 6x19 wire rope would be().
A.6 inches in diameter and 19 fathoms long
B.6 inches in circumference with 19 strands
C.6 strands with 19 wires in each strand
D.19 strands with 6 wires in each strand