问题 单项选择题

最小极限尺寸与基本尺寸的代数差,叫()。

A、上偏差;

B、下偏差;

C、极限偏差;

D、标准偏差。

答案

参考答案:B

阅读理解

阅读理解

       An old porter worked at the railway station for a long time. One morning he was standing and waiting for travelers to ask him to help them with their luggage(包裹), when he saw a short man running wards to

the train with a big bag in his hand.

       The porter watched the man for a few seconds, and then the man saw him. At once the short man ran up to the porter and asked, "Can I catch the 10:35 train to London, porter? "He was breathing very fast,

and he seemed worried.

       The old porter looked at him for a moment and then said with a smile, "Well, sir, I'd like to help you,

but I can't answer your question because I don't know how fast you can run along rails. You see," he

explained, "The 10:35 train to London left five minutes ago."

1. A porter's job is_______.

A. to stand in the railway station

B. to answer the travelers' questions

C. to help the travelers carry their luggage

D. to ask the travelers to help him

2. One morning a short man ________.

A. was waiting for the porter to help him

B. was running along rails

C. was waiting for the train to London

D. was in a hurry to catch the 10:35 train to London

3. The short man looked worried because _______.

A. he couldn't run so fast as the train

B. he wanted to knows if he could catch the 10:35 train to London

C. the porter watched him for a few seconds

D. he lost his bag

4. At the end of the story, the porter ________.

A. told the short man there was no 10:35 train to London

B. told the short man when he could catch the train

C. helped the short man to catch the train

D. played a joke on the short man

5. When the porter told the short man the train had left, the time was _______.

A. 10:40

B. 10:35

C. 10:30

D. 10:45

单项选择题