在系统设计时应考虑的主要系统指标有:信道呼损率、覆盖区内可接通率、()、系统在基站接

题型:单项选择题

问题:

在系统设计时应考虑的主要系统指标有:信道呼损率、覆盖区内可接通率、()、系统在基站接收端收到的上行噪声电平值。

A.覆盖区边缘接收场强

B.隔离度

C.掉话率

D.干扰值

考点:通信工程师室内覆盖系统室内覆盖系统题库
题型:单项选择题

某物理课外兴趣小组,为测量一根细长而均匀的金属材料样品的电阻率:

(1)他们先用多用表电阻“×1”挡测量金属丝的电阻时表针指示如图1所示,由此可粗测得金属丝的电阻为______Ω.

(2)为了更准确测量金属丝的电阻,他们准备用伏安法测量金属丝的电阻,由于电流表和电压表的电阻未知,他们将可动触头由位置a移到位置b,同时观察电流表和电压表示数的变化,发现电流表A的示数变化显著.为减小误差,你认为宜将可动触头P接______(a或b).

(3)由于电流表和电压表不是理想的,图2中的测量电路存在系统误差,若可动触头P接a,则Rx的测量值______真实值(填“等于”、“大于”、“小于”)

(4)图3、4中分别为用螺旋测微器测金属丝的直径d,用电压表、电流表测金属丝上电压U和电流I的刻度示意图,请分别写出对应的读数:d=______mm,U=______V,I=______A.

题型:单项选择题

Bill and Simon were good friends. One summer they were on (1) h   ____    . They wanted to sail around the Caribbean Sea in their boat for two weeks.

During their trip, they saw many whales. Bill and Simon were very (2) e__________ because they had wanted to see them very much. Unluckily, (3) w   __   ___  they were watching them, the whales began to hit the side of the boat.

Suddenly, (4) w ______       started coming in, and they realized that they were in trouble. They (5) q_ _____       jumped into the lifeboat before the sank(沉没), and watched it disappear under the sea.

Luckily, they had enough food and water for about twenty (6) d     __ ___. They also had a fishing line and a machine which could change sea water () i             

drinking water. These two things helped them to survive(存活) during their terrible experience.

For the next fifty days they caught about ten fish a day and (8) a  _____      them. They saw about twenty ships, but although they waved and shouted when the ships were passing, (9) n _________       saw them. They were becoming weaker and weaker. Then, just as they were beginning to (10) l _______________  hope, a fishing boat saved them.  

题型:单项选择题

事故应急指挥机构或者电力监管机构应当按照有关规定,统一、准确、及时发布有关()、()、()等信息。

题型:单项选择题

期货投资者保障基金管理机构应当定期编报保障基金的筹集、管理、使用报告,经会计师事务所审计后,报送( )。

A.财政部

B.中国证监会

C.中国人民银行

D.期货业协会

题型:单项选择题

收银员发现假卡应如何处理()。

A、保证自身安全,和平没收卡片

B、商户在没收卡片后,应立即将没收的卡片沿水平方向(不破坏磁条)剪成两半

C、商户需在没收卡片的当日将没收卡提交给收单银行

D、收银员可自行处理卡片

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