在图示系统中,绳DE能承受的最大拉力为10kN,杆重不计。则力P的最大值为:() A

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问题:

在图示系统中,绳DE能承受的最大拉力为10kN,杆重不计。则力P的最大值为:()

A.5kN

B.10kN

C.15kN

D.20kN

考点:水利水电工程第四章理论力学第四章理论力学题库
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Healthy teeth are important in many ways. For example, when we get our pictures taken, everyone says “Say cheese!” So we open our mouth and show our teeth.

小题1:Strong and healthy teeth help us chew the right food to grow. They also help us speak clearly and look our best. 小题2:我们必须照顾好我们的牙齿。What should we do to protect our teeth?

First, we should brush them at least twice a day—after breakfast and before bedtime. We should brush all of our teeth, not just the front ones. 小题3: We should spend at least 3 minutes each time brushing teeth.

小题4:一年看两次牙医也很重要。Besides checking for disease, the dentist will help keep our teeth extra clean.

小题5:We also need to be careful about what we eat and drink. Remember to eat more vegetables and fruit and drink more water. Of course, don’t forget to smile!

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石灰最佳煅烧温度为1150-1200℃。

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按点击付费搜索引擎营销广告(PPCSEM)与传统的广告、营销或促销形式最重要的不同是其“()”特性。

A.非干扰

B.互扰

C.相互影响

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青铜是指铜和()的合金,因颜色青灰而得名,出现于战国时的古书。

A.钴

B.锡

C.锰

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简述农业推广经营服务的主要领域与内容。

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