某患儿，半岁，营养发育差，伴贫血。皮肤黏膜反复出现肉红色糜烂面或浅表性溃疡；1月前又

直接写得数。

49-40= 5×4= 32-12= 5×6= 30+9= 4×6= 6×3= 35+4=

                      

超声的生物学效应的叙述，错误的是（）

A.声功率单位是W/cm

B.产科胎儿IOB<20mW/cm

C.声强是单位面积上的声功率

D.探头发射超声脉冲时将电能转换为声能

E.声功率是单位时间内超声探头发出的声功

地球的平均半径为63710千米（）

(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 now 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 opt~electrical 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) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A．ADSL

B．FTTC

C．HFC

D．FTTH

前列腺素在妇产科临床一般不用于（）。

A.药流

B.中引

C.晚期妊娠引产

D.产科促进宫颈成熟

E.子宫肌瘤