如图，在xOy平面内有一列简谐横波沿x轴正方向传播，M、N为传播方向上的两点，在

导致成人肾实质性高血压最常见的疾病是（）

A.慢性肾盂肾炎

B.肾动脉狭窄

C.肾动脉硬化

D.急性肾小球肾炎

E.慢性肾小球肾炎

There’re few oranges in the box，_____ ？

A．aren’t they

B．aren’t there

C．are they

D．are there

Configuration management is the process of managing change in hardware, software, firmware, documentation, measurements, etc. As change requires an initial state and next state, the marking of significant states within a series of several changes becomes important. The identification of significant states within the revision history of a configuration item is the central purpose of ______ identification.

A．baseline

B．value

C．cost

D．Control

万方数据能检索到的图书《密码理论与技术》作者是（）

A.王芹

B.王天芹

C.范明钰

D.无名氏

SDH信号最基本的模块信号STM-1速率为（ ）。

A．600.080Mbps

B．622.080Mbps

C．466.560Mbps

D．155.520Mbps