问题 选择题

用刚从冰箱里拿出来的毫米刻度尺去测量机器零件的长度,这样测量的结果将会(    )

A.偏大

B.偏小

C.正常

D.无法比较

答案

答案:A

题目分析:刚从冰箱里拿出来的毫米刻度尺,由于热胀冷缩的缘故,刻度尺会变短一些,再去测量一个机器零件的长度,刻度尺显示的示数会比实际值要大一些.

点评:此题主要考查的是误差形成的原因以及产生的结果.误差产生的原因有两个:主观因素和客观因素.温度对刻度尺产生的影响属于客观因素.

单项选择题

More and more residences, businesses, and even government agencies are using telephone answering machines to take messages or give information or instructions. Sometimes these machines give (1) instructions, or play messages that are difficult to understand. If you (2) telephone calls, you need to be ready to respond when you get a (3)

The most common machine is the (4) used in residence. If you call a home (5) there is a telephone answering machine (6) you will hear several rings and then a recorded message that (7) says something like this: "Hello. We can’t come to the (8) right now. If you want us to call you back, please leave your name and number after the beep." Then you will hear a "beep", (9) is a brief, high-pitched (10) . After the beep, you can say who you are, whom you want to speak to, and what number the person should call to (11) you, or you can leave a (12) . Some telephone answering machines record for only 20 or 30 seconds after the beep, (13) you must respond quickly.

Some large businesses and government agencies are using telephone answering machines to provide information on (14) about which they receive a large volume of (15) . Generally speaking, using these systems (16) you to have a touch-tone phone ( a phone with buttons rather than a rotary dial). The voice on the machine will tell you to (17) a certain button on your telephone if you want information on Topic A, another button for Topic B, and so on. You listen (18) you hear the topic you want to learn about, and then you push the (19) button. Immediately after making your (20) , you will hear a recorded message on the topic.

2()

A.commands

B.requires

C.asks

D.requests

单项选择题 B1型题