IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.

A．dropped

B．proved

C．improved

D．upgraded

烧伤治疗应用抗生素的原则

A．高热时，不可停用抗生素

B．出现脓毒症早期表现时，创面应外用敏感抗生素

C．提倡经验用药

D．出现脓毒症早期表现时，无需等待细菌培养结果，立即经验用药

E．切痂手术开始时，应静脉应用敏感抗生素