关于复合麻醉的基本原则，下列哪几项正确（）

A.每种药物的药效和药代动力学必须有深刻的了解

B.药物和选配要以满足手术基本要求为原则

C.静脉全麻期间必须保证呼吸道通畅，除短小手术外，均应气管内插管

D.静脉维持用药应选半衰期短、代谢快和苏醒快的药物

E.实施静吸复合麻醉时必须坚持以静脉用药为主，吸入麻醉为辅的原则

All else being equal, in a rising interest rate environment, the price of a floating-rate security will mo.st likely decline if:（）

A. there is no cap.

B. the margin required by investors declines.

C. the coupon is reset every six months rather than monthly.