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【单选题】
一对圆柱齿轮传动，通常把小齿轮的齿宽取值比大齿轮略大，其主要目的是（）A.
使小齿轮的强度比大齿轮略高一些
B.
减小传动中的动载荷
C.
为了便于安装，保证有效接触宽度
D.
避免沿齿向载荷分布不均匀
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【单选题】During 1930s, why did the percentage of 17-year-olds who graduated from high school jumped greatly?
A.
Because they believed high school education is necessary.
B.
Because they couldn't find jobs and they had no better choices.
C.
Because the cost of going to school was reduced.
D.
Because they believed high school education could help them make more money in the future.
【单选题】The writer thinks Miss Jackson is______.
A.
poor but brave
B.
friendly and talkative
C.
a teacher liked by all her pupils
D.
an example her children should follow
【简答题】During the time of a lecture, it is by _____ that everyone keeps silent and that no one is allowed to stop the speaker. 2. Lucy was _____ and quiet while her brother was sure and noisy. 3. We have to ...
【单选题】--- Look! That teacher is explaining something to her students again and again. --- _________ teacher she is.
A.
How patient
B.
What a patient
C.
How stubborn
D.
What stubborn
【简答题】The time, usually between the ages of 13 to 19, when a young person is developing into an is called ( ). Exercises ( ) to one's health. The teacher ( ) pictures among c...
【简答题】Many works of art
produced during the 1930s carried blatantly political messages.
【简答题】从A、B、C、D四个选项中，选出与句子划线部分意义相同或相近并能替代的那一项。 1. —Who is your favorite t eacher? —Miss Wu. She is my Chinese teacher. I like her very much . A. very B. great C. lots of D. a lot 2. — When is your first clas...
【单选题】What is one reason for the change in the length of the workweek for the average worker in the United States during the 1930s?
A.
Several people sometimes shared a single job.
B.
Labor strikes in several countries influenced labor policy in the United States.
C.
Several corporations increased the length of the workweek.
D.
The United States government instituted a 35-hour workweek.
【简答题】Dear editor, My English teacher is very strict with us. Several days ago, when we were in class, Tom asked me a question. But my English teacher thought we were speaking in class. She asked us to stan...
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