若以∑q1po/∑qopo为造价指数，则该指标属于（）。 A.以基期的质量指标作为同

数轴上A、B两点所对应的数分别是4和-6，则A、B两点间的距离为（　　）

A．-2

B．2

C．-10

D．10

试举出四种常用的中水处理流程。

为了保障人们用药安全，给药品再评价、淘汰药品和临床用药提供信息，自20世纪（）年代国外开始建立药品不良反应监测报告制度。我国从（）年正式实施药品不良反应监测报告制度。

(56) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.

(57) 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.

(58) is an approach preferred by cable TV providers. In this solution the fiber terminates at an opto-electrical converter and the final segment is a shared coaxial cable.

(59) is a device used to connect two separate network that use different communication protocol.

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

（56）是（）

A.MD

B.RSA

C.DES

D.MIB

( )表示管道走向及电气线路等的设计图主要有电气设备施工图。