当试件内存在较大的内应力时,将使超声波的()及()发生变化。
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目前,我国客运价格实行政府定价、政府指导价和市场调节价三种方式。
A. 正确
B. 错误
广联达工程量清单编制软件中,分部分项工程量清单存档时清单编码可修改。
A. 正确
B. 错误
Camping Camping wild is a wonderful way to experience the natural world and, at its best, it makes little environmental influence. But with increasing numbers of people wanting to escape into the wilderness, it is becoming more and more important to camp unobtrusively (不引人注目地) and leave no mark. Wild camping is not permitted in many places, particularly in crowded lowland Britain. Wherever you are, find out about organizations responsible for managing wild spaces, and contact them to find out their policy on camping and shelter building. For example, it is fine to camp wild in remote parts of Scotland, but in England you must ask the landowner's permission, except in national parks. Camping is about having relaxation, sleeping outdoors, experiencing bad weather, and making do without modern conveniences. A busy, fully-equipped campsite (野营地) seems to go against this, so seek out smaller, more remote places with easy access to open spaces and perhaps beaches. Better still, find a campsite with no road access: walking in makes a real adventure. Finding the right spot to camp is the first step to guaranteeing a good night's sleep. Choose a campsite with privacy and minimum influence on others and the environment. Try to use an area where people have obviously camped before rather than creating a new spot. When camping in woodland, a void standing dead trees, which may fall on a windy night. Avoid animal runs and caves, and possible homes of biting insects. Make sure you have most protection on the windward side. If you make a fire, do so downwind of your shelter, always consider what influence you might have on the natural world. Avoid damaging plants. A good campsite is found, not made — changing it should be unnecessary. Wild camping is always permitted in many places.()
A. True
B. False
C. Not Give
作为目前全球最受瞩目的新一代光源,LED因其高亮度、低热量、长寿命、无毒、可回收再利用等优点,被称为是21世纪最有发展前景的绿色照明光源。LED产业链包括LED外延片生产、LED芯片生产、LED芯片封装及LED产品应用等四个环节。一般将外延生产视为这个产业的上游,芯片制造为中游,封装以及应用为下游。产业链的上游具有技术和资本密集的特点,下游的进入门槛相对较低。从产业链上看,我国在LED衬底、外延、芯片环节比较薄弱。目前,在从事LED照明灯具产品生产的企业中,高端产品仍然以国外厂商为主。而反观国内LED灯具生产企业,普遍存在规模小、技术实力弱、产品档次低的现状。我国高光效、高可靠的LED应用产品几乎全部依赖于进口的高档外延芯片,我国的LED外延芯片生产近年虽有很大发展和进步,但仍停留在中低档水平。目前,上海、北京、深圳等一线城市,随着第一批LED显示屏相继计入更新换代的时期,客户更加注重产品品质和维护服务了,对产品的要求也比以前更高了。因此,“粗放型”的市场模式再也不能满足用户需求了,正是看到了这种市场转型特征,一批批在国外享有较高知名度的一流企业寻机进入中国市场,陆续在国内成立了本土团队,给原本就竞争相当激烈的LED市场带来了巨大的冲击。之所以说他们带来的冲击是巨大的,因为他们在国外有着多年的经验,产品经历了成熟市场考验,形成了不可抗拒的品牌优势。要求:(1)在新兴产业中,风险与机遇共存,而风险与机遇都来源于产业的不确定性。简述新兴产业中的战略制定过程如何处理好其不确定性。(2)处理与把握新兴产业的机会与风险是最具有挑战性的战略问题。简要分析LED产业中的公司要想取得成功,应该采取的对策。(3)简述新兴市场本土企业可供选择的战略类型及其内涵,分析我国LED企业可选战略建议。