用频谱多普勒超声检测血流时，下列仪器调节方法中错误的是（） A.超声波入射角校正到大

后处理

萎缩性鼻炎用复方薄荷油滴鼻的作用是()

A.润湿鼻腔黏膜

B.促进黏膜血液循环

C.软化脓痂

D.降低鼻黏膜水分蒸发

E.促进黏膜上皮生长

(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．Router

B．Gateway

C．Bridge

D．hub

既往患过伤寒，现无症状，胆汁培养有伤寒杆菌生长为（）

A．隐性感染 

B．病原携带状态 

C．潜在性感染 

D．显性感染 

E．既往有过感染 

进入中学后，老师会更多地指导和启发我们自己去发现问题、研究问题、解决问题，这说明：[ ]

A、中学阶段的学习任务变重了；  

B、初中老师的授课方式不同于小学老师；

C、初中老师的知识比小学老师渊博；

D、中学的课程比小学多了。