锚索结构分为三段：内锚固段、钢绞线自由段和外锚固段。
参考答案：对
亚硝酸盐中毒的特效解毒剂是（）
A.阿托品
B.乙酰胺
C.维生素K1
D.亚甲蓝（美蓝）
E.纳洛酮
Financial derivatives contribute to market completeness by allowing traders to do all of the following EXCEPT :()
A. increase market efficiency through the use of arbitrage.
B. narrow the amount of trading opportunities to a more manageable range.
C. engage in high risk speculation.
