问题 填空题

如图所示,重为525N的人躺在死海的水面上悠闲地阅读,她受到海水的浮力是______N,浸入海水中的体积是________m3.(ρ海水=1.05×103kg/m3

答案

525,0.05

题目分析:∵人漂浮在水面上,

∴F=G=525N,

∵FVg,

∴排开水的体积:

所以答案为:525,0.05

点评:本题考查了学生对漂浮条件、阿基米德原理的了解与掌握,利用好阿基米德原理“F⇔V”是本题的关键.

完形填空

Task Reading:

下面是今年部分旅游线路介绍及想出游人的兴趣特点介绍.请阅读相关信息并根据出游人的兴趣特点帮他们选择合适的旅游线路。请将答案的字母编号写在答题卷标号为52-55的横线上。

Here is a selection of the tours organized for the coming year:

A:  8 days mountaineering trip--climb Yunnan's third highest peak, the Haba snow mountain. This is ideal for the truly adventurous. You need to be fit and healthy.

B:  8 days cycling tour from Qiaotou Town--visit the spectacular Tiger Leaping Gorge. It is a leisurely tour suitable for anyone who is reasonably fit and healthy. No previous cycling experience is necessary and all our routes are on flat land!

C:  8 days river rafting--white water adventure on the Yangtze from the old town of Lijiang. This adults-only tour is exclusively for good swimmers and physically fit.

D:  10 days rainforest trek(乘牛车旅行)--spend 5 days in the forest and meet the local people. This is a walking tour and no previous experience is needed, just a curious mind and an interest in traditional cultures.

E:  10 days horse trekking tour--visit authentic Tibetan villages of Shangri-la. The ultimate horse-riding experience in a spectacular mountain environment. This trip is for confirmed riders only. Don't expect three-star hotels on this trip.

请阅读以下有出游意向的人的要求,然后匹配旅游线路所适合的出游者。

52. _______ A family of four, including parents, a sixteen-year-old son and a thirteen-year-old daughter, who are looking for a fun holiday. All four are good riders and strong swimmers.

53. _______ A retired couple who are reasonably fit and who want to find out more about ethnic minorities' cultures.

54. _______ A group of four young adults who are into all extreme sports and are looking for something with plenty of excitement. They are more interested in the scenery than in the life style of the locals.

55. _______ A family of five including a ten-year-old girl. They have many different interests and they are looking for a relaxing holiday.

问答题


下面是关于某测试设备的叙述,仔细阅读并分析,回答问题1至问题4,将答案填入对应栏内。
【说明】
某测试设备是一个嵌入式系统,是为了测试一个专用设备而研制的,如下图所示。测试设备用于测试被测设备的各项软、硬件功能,包括2路RS232串口、2路模拟量、电源以及专用设备的其他内部部件。在被测专用设备内部有专门的自检测程序,来测试内部各部件。测试设备的串口与被测设备相连接,加电后,通过按测试设备的周边键与被测设备握手同步,再向被测设备发送检测消息,被测设备测试自己的某项功能后,通过串口将测试结果发回给测试设备,显示在测试设备的LCD屏上。
测试设备的硬件由处理器模块、IO模块和电源模块组成,处理器模块上有CPU、存储器、2路串口、键盘控制器;IO模块上有D/A、A/D转换器,用作为模拟量输入和采集电源的电压值,以测试被测设备的模拟量和电源;电源模块提供测试设备的电源;测试设备模块间采用ISA总线。
测试设备的2路串口与被测设备相连,同时测试设备的D/A、A/D转换控制器的输入线路与被测设备的模拟量和电源线相连,可直接测试被测设备的2路RS232串口、2路模拟量、电源。
测试设备的软件由底层驱动(串口驱动、D/A、A/D驱动和自定义键盘驱动)、嵌入式操作系统和测试软件组成。

【问题3】
请把下面列出的6个空位的答案填入相应的位置。
1.ISA总线为 (1) 位总线。
2.由模拟信号到数字信号的转换过程称为 (2)
3.将数字信号变成模拟信号的过程称为 (3)
4.D/A转换器的主要性能指标有 (4) (5) (6) 。(回答其中的三个主要性能指标即可)