根据串行通信规程规定，收发双方的（）必须保持相同。A、外部时钟周期； B、波特率因子

某高层钢筋混凝土框架结构，抗震等级为一级，混凝土强度等级为C30，钢筋采用 (f_yv=270N/mm²)。框架梁h₀=340mm，其局部配筋如图所示，根据梁端截面底面和顶面纵向钢筋截面面积的比值和截面的受压区高度，试判断关于梁端纵向受力钢筋的配置，并提出其中何项是正确的配置（）

A．

B．

C．

D．前三项均非正确配置

利率是债券票面要素中不可缺少的内容，债券利率亦受很多因素影响，其主要影响因素不包括( )。

A．借贷资金市场利率水平

B．筹资者的资信

C．债券期限长短

D．资金使用方向

阅读理解

                                                             Body and Food

      Your body, which has close relations with the food you eat, is the most important thing you own, so

it needs proper treatment and proper nourishment (营养).The old saying "An apple a day keeps the

doctor away"is not as silly as some people think. The body needs fruit and vegetables because they

contain vitamin C. Many people take extra vitamins in pill form, believing that these will make them

healthy.

     But a good diet is made up of nourishing food and this gives all the vitamins you need. The body

doesn't need or use extra vitamins, so why waste money on them?

     In the modern western world, many people are too busy to bother about eating properly. They throw

anything into their stomachs, eating hurriedly and carelessly. The list of illnesses caused or made worse

by bad eating habits is frightening,

1. "Your body has close relations with the food you eat." It really means that ______.

A. all kinds of food you eat can be made into your body

B. your body is made up of the food you eat

C. what you eat has great effect on your health

D. the more you eat, the fitter you will feel

2. The old saying referred to in the, passage tells us that ______.

A. eating apples regularly does lots of good to our health

B. the apple is the best among all kinds of fruits

C. apples can take the place of doctors

D. an apple is a sure cure for illness

3. In the second paragraph, the writer tries to let us know ______.

A. our bodies need food or we can't live

B. often eating apples is a good habit

C. taking extra vitamin pills is completely useless

D. a good diet is of great importance for our health

4. In the modern western countries ______.

A. people don't want to pay more attention to their eating

B. lots of people's illnesses are caused or made worse by bad eating habits

C. people throw everything into their stomachs without chewing

D. people are only too busy to cook meals for themselves

5. From the passage we can draw a conclusion that if we want to keep healthy,we should ______.

A. only eat an apple a day

B. eat properly

C. take as many vitamin pills as possible

D. throw something into our stomachs slowly and carefully

下列哪一指标为相对比（）

A.中位数

B.均数

C.构成比

D.变异系数

E.标准差

CDMA2000 1x系统中的Handoff Direction Message是通过（）信道发送