以下缩略语错误的是( ) A: CRBS:导管相关性血流感染( catheter related blood stream infection) B: PVC:中心静脉导管( peripheral venous catheter) C: PICC:经外周静脉置入中心静脉导管( peripherally inserted central catheter) D: PN:肠外营养( parenteral nutrition)

Bioavailability of drugs is A: established by FDA regulation at 100% for preparations for intramuscular injection B: 100% for oral preparations that are not metabolized in the liver C: calculated from the peak concentration of drug divided by the dose administered D: important because bioavailability determines what fraction of the administered dose reaches the systemic circulation E: equal to 1 (100%) only for drugs administered by any parenteral route