B2010型龙门刨床V55系统当电动机低于额定转速采用()方式调整。 A.恒功率 B

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问题:

B2010型龙门刨床V55系统当电动机低于额定转速采用()方式调整。

A.恒功率

B.恒转矩

C.恒力矩

D.弱磁

考点:维修电工考试维修电工(技师)维修电工(技师)题库
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四、单句改错,每题1分共5分:

1. He made a trick on her by taking all the money.

2. Now plastic can take place of steel in may ways in life.

3. She apologized the teacher for losing her book.

4. He didn’t turn down for some reason.

5. I was really anxious about you. You should have left home without a word.

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阅读理解。

     Many Americans go to work five days a week. American students go to school five days a week, too. So they

usually have a two-day weekend. The weekend is Saturday and Sunday. At the weekend, people spend their time

in many different ways(不同的方式). Sometimes they play with friends. Many families enjoy weekends together.

     Many American families do some sports at the weekend . For example(例如), in summer, they enjoy swimming

and biking. In autumn, they like playing volleyball and tennis. In winter, they go skating (滑冰) and skiing(滑雪).

In spring, they like sightseeing(观光) and hiking(徒步旅行.) How happy they are!

     Do you have an enjoyable weekend?

1.How many days do many Americans go to work a week?

A. Five days    

B. six days    

C. seven days    

D. Four days

2.How do Americans spend their weekends?

A. In one way            

B. In two ways    

C. In three ways          

D. In many different ways. 

3. What sports do many Americans do in summer?

A. swimming and biking      

B. playing volleyball and tennis.

C. skating and skiing        

D. sightseeing and hiking

4. Which one is not true( 不真实的 )?

A. American schools are open five days a week.

B. In America, people usually have a one-day weekend.

C. people often play volleyball and tennis in autumn.

D. Many American families enjoy weekends together. 

5. When is weekend?

A. Sunday  

B. Saturday  

C. Friday and Saturday  

D. Saturday and Sunday

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生物多样性最直观、最基本的认识是______多样性。

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信用合作社各项存款是指信用社吸收的企事业单位、经济组织和居民储蓄存款。()

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某水产进出口公司2004年4月进口一批速冻水产品,进口成交价格150万元,运输保险费为2万元;又从农业生产者手中收购一批鱼苗出口,货物出口离岸价格92万元,运至境内输出地点装载前的运输、装卸、储藏等费用共计4.6万元。假设进口货物关税税率25%,出口货物关税税率15%。下列关于该公司应纳应退各种税额的表述正确的有( )。

A.进口环节应缴纳关税38万元

B.进口环节应缴纳增值税24.7万元

C.出口环节应缴纳关税12.69万元

D.出口环节应按照“免抵退”计算增值税

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