(66) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string. (67) is a protocol that most USENET machines how use it to allow news articles to propagate from one machine to another over a reliable connection. (68) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable. (69) is a device used to connect two separate network that use different communication protocol. (70) js a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A．NNI

B．NRZ

C．NAK

D．NVT

男性，8岁。右大腿下端疼痛、肿胀、皮温升高2天。查体：T39.8℃，拟诊为急性化脓性骨髓炎。在骨膜或骨髓内抽得脓液后，最关键的治疗措施是（）

A.静脉注射抗生素+钻孔引流

B.多次抽脓

C.肢体制动

D.大剂量抗生素

E.卧床休息