Rt△ABC中，∠C=90°，AB=5，AC=4，把Rt△ABC绕着它的一条直角

(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

ABO正反定型

平行光线经过某镜片后在2m处形成焦点，该镜片的屈光力为

A．2D

B．1D

C．3D

D．0.5D

E．0.25D

X6132型铣床功率大，操作复杂，只能加工中小型平面和小型箱体上的孔。

2010年5月1日内蒙古自治区成立63周年，这是一个有重大历史意义的日子，它开创了中国民族区域自治制度的先河，建立了第一个省级少数民族自治区。民族区域自治制度的核心内容是（）。

A.坚持民族平等

B.民族独立

C.民族自治地方的自治权

D.各民族各自当家作主