一个铸模由密度为0.6 ×103 kg/m3 的实心木质材料制成,质量为1.2

题型:填空题

问题:

一个铸模由密度为0.6 ×103 kg/m3 的实心木质材料制成,质量为1.2 kg ,用密度为 2.7 ×103 kg/m3 的铝浇铸20 个这样的铸件需要铝的总质量是________kg 。

考点:密度公式的应用
题型:填空题

阅读理解.根据短文内容,选择正确答案。

     In almost every big university(大学)in the United States, football is a favorite sport. American

football is different. Players sometimes kick the ball, but they also throw the ball and run with it.

They try to take it to the other end of the field. They have four chances(机会)to move the ball

ten yards(码). They can carry it or they can throw it. If they move the ball ten yards, they can

try to move it another ten yards. If they move it to the end of the field, they receive six points(点).

     It is difficult to move the ball. Eleven men on the other team try to stop the man with the ball.

If he does not move the ball ten yards, his team kicks the ball to the other team.

Each university wants its own team to win. Many thousands of people come to watch. They all

shout for their favorite team.

     Young men and women come on the field to help the people shout more. They dance and

jump while they shout.

     Each team plays ten or eleven games each season.

     The season begins in September and ends in November. If a team is very good, it may play

another game after the season ends. The best teams play again on January 1st, the first day of the

New Year. Many people go to see these games and many others watch them on TV.

1.The passage talks about ______.

A.football                        

B.how to play football

C.American sports            

D.American football

2.We can ______ the football in both American football and Chinese football.

A.kick    

B.throw

C.run with

D.catch

3.Why is it difficult to move the ball? Because ______.

A.ten yards is a long way

B.many men on the other team try not to let the ball come near

C.the playing field is very large

D. eleven men have to catch the ball one by one

4.If they ______, the teams will play on January 1st.

A.receive six points

B.play eleven games in the season

C.are the best teams    

D.move the ball to the end of the field

5.Many people come to watch football and they want their team to win.

   Which of the following is not their act?

A.Jumping

B.Dancing

C.Crying    

D. houting

题型:填空题

莲子的功效是()。
鳖甲的功效是()。

A.益肾健骨,软坚散结

B.固精止带,补脾止泻,益肾养心

C.养血补心,软坚散结

D.滋阴潜阳,退热除蒸,软坚散结

E.润燥滑肠,软坚散结

题型:填空题

从发热的观点而言,主断路器分、合闸线圈均属于短时工作制。

题型:填空题

如果可贷资金市场中的实际利率低于均衡的实际利率水平,那么,可贷资金供给量()可贷资金需求量,而实际利率会()。

A、大于、上升

B、大于、下降

C、小于、上升

D、小于、下降

题型:填空题

()通常是可以写下了、转移及分享,可以成文件化表现在各种媒介,也可以通过相关法律有效保护。

A、内隐知识

B、外显知识

C、外隐知识

D、内显知识

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