湖泊富营养化是由( )一类因子引起的。
A.(A) 氮、磷等植物营养物质
B.(B) COD和石油类等
C.(C) BOD和COD
D.(D) BOD和石油类
参考答案:A
下列哪一类药物能够提高冠心病、慢性心力衰竭患者的运动耐量、降低病死率()
A.洋地黄
B.ACEI与ARB
C.利尿剂
D.硝酸酯类
E.α受体拮抗剂
I always think of books with unutterable feelings, being deeply indebted to them, as I am, for the warmth they have brought me.()
A. preferred
B. mixed
C. profound
D. dissatisfied