重度急性有机磷杀虫药中毒时胆碱酯酶值在（）

A.100%

B.50%～70%

C.30%～50%

D.30%以下

E.90%

Which area is the most commodities shipped in water transport?（）

A. In international deep sea

B. In lakes

C. In river and canals

D. Coastal ocean