两位同学利用图乙所示的可以绕O点自由转动的健身器材进行锻炼,甲同学竖直向下用力F

题型:操作题

问题:

两位同学利用图乙所示的可以绕O点自由转动的健身器材进行锻炼,甲同学竖直向下用力F1将另一端的乙同学拉起。请画出拉力F1的力臂L1

考点:力臂的画法
题型:操作题

Early to bed, early to rise, makes a man healthy, wealthy and wise.

This is an old English saying. Do you know it before? It says that we must go to bed early and get up early in the morning. Then we should be healthy. We should also be rich (wealthy) and clever (wise).

This is true. The body must have enough sleep to be healthy. Children of a young age should have ten hours’ sleep every night. Children who don’t have enough sleep can’t do their work very well. They will not be wise and they may not become wealthy!

The body also needs exercise. Walking, running, jumping, swimming and playing games are all exercise. Exercise keeps the body strong.

Exercise also keeps the blood(血液)moving around inside the body. This is very important. Our blood takes food to all parts of our body. The head also needs blood. Exercise helps us to think better!

小题1:If a child doesn’t have 10 hours’ sleep every night, he _____.

A.will become wise

B.won’t do well in his work

C.will have to sleep in the daytime

D.can’t go to school in time小题2:A person needs exercise because ______.

A.it makes him healthy

B.he has a lot of homework to do

C.it doesn’t need time

D.it is fun to do exercise小题3:Exercise makes the _______ move quickly and smoothly.

A.body

B.blood

C.children

D.head小题4:Which of the following is not true?

A.Exercise is good for a person’s head

B.A student should have 10 hour’s sleep.

C.It’s good for you to get up early and go to bed early.

D.If you have enough blood, you’ll be wise

题型:操作题

滤油器的性能参数不包括()。

A.过滤精度

B.初始压力损失

C.公称流量和公称压力

D.使用寿命

题型:操作题

鸭绿江是我国和哪个邻国的分界线所在地?()

A.韩国

B.朝鲜

C.蒙古

D.巴基斯坦

题型:操作题

焊接灰铸铁时加速冷却焊缝的目的是()。

A、减小焊件变形

B、防止焊缝剥离

C、避免熔池过热

D、防止热裂纹

题型:操作题

2010年国务院()强调了新形势下加强法制政府建设。

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