移动端

  • 题王微信公众号

    题王微信公众号

    微信搜“题王网”真题密题、最新资讯、考试攻略、轻松拿下考试

单选题

绝缘手套要定期试验,试验周期一般为()个月。

发布日期:2021-03-22

绝缘手套要定期试验,试验周期一般为()个月。
A

1

B

3

C

6

题王网让考试变得更简单

扫码关注题王,更多免费功能准备上线!

此试题出现在

特种作业考试

电工特种作业操作证

去刷题
热门试题热门资讯 相关试题

地基基础设计一方面要满足上部结构的要求,另一方面必须满足地基土的(  )的要求。

稳定可重复的颌位是(  )。

In this section, there is one passage followed by a summary. For Answers 1 to 5, please read the passage carefully and complete each space in the summery, using a maximum of three words from the passage. Remember to write the answers on the answer sheet.  Conventional wisdom says trees are good for the environment. They absorb carbon dioxide—a greenhouse gas—from the atmosphere and store it as carbon while releasing oxygen, a process for which forests have been called “the lungs of the planet”. The roots of trees have been thought to trap sediments and nutrients in the soil. Trees have also been credited with steadying the flow of these rivers, keeping it relatively constant through wet and dry seasons, thus preventing both drought and flooding. It is all nonsense, concludes a research published this week. A four—year international study led by researchers at the University of Newcastle, in Britain, and the Free University of Amsterdam, identifies several myths about the link between forests and water. For example, in arid and semiarid areas, trees consume far more water than they trap. And it is not the trees that catch sediments and nutrients, and steady the flow of the rivers, but the fact that the soil has not been compressed.  The World Commission on Water estimates that the demand for water will increase by around 50% in the next 30 years. Moreover,around 4 billion people—one half of the world’s population—will live in conditions of severe water stress, meaning they will not have enough water for drinking and washing to stay healthy, by 2025.  The government of South Africa has been taking a tough approach to trees since it became the first to treat water as a basic human right in 1998. Trees lose water through evaporation (the technical term is transpiration) at twice the rate of grassland or South Africa's unique fynbos scrubland. In a scheme praised by the hydrologists, the state penalizes forestry companies for preventing this water from reaching rivers and underground aquifers.  In India, large tree-planting schemes not only lose valuable water but complicate the true problem identified by the hydrologists: the unregulated removal of water from aquifers to irrigate crops. Farmers need no permit to drill a borehole and, as most farmers receive free electricity, there is little economic control on the volume of water pumped. In the Kolar district in Karnataka, wells have dried up as the water table has plummeted from six metres to 150 metres below ground.Summary:

商务谈判的基本简述宾主的握手礼仪

必须在广告中注明"本广告仅供医学药学专业人士阅读"的药品是()

小麦地中茎的作用是保护幼芽出土。

运行图是铁路运输工作的()和()的基础。

鼎汉PZ系列智能电源屏外电网输入电压正常时,只闭合一路KM1、KM4吸合;只闭合二路()吸合;一二路同时闭合KM1、KM3吸合;

尖晶石是均质体?还是非均质体?

女性,18岁,月经不来潮就诊。超声检查如图,最可能的诊断为()