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先张法预应力混凝土在放张预应力筋时，混凝土强度必须符合设计要求，设计未规定时，不得低于强度设计值的()。
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Climate change is one of the most important environmental issues facing humankind. Understanding the potential impacts of climate change for natural ecosystems is essential if we are going to manage our environment to minimize the negative consequences of climate change and maximize the opportunities that it may offer. Because natural ecosystems are complex, nonlinear systems, it follows that their responses to climate change are likely to be complex. Climate change may affect natural ecosystems in a variety of ways. In the short term, climate change can alter the mix of plant species in land ecosystems such as grasslands. In the long term, climate change has the potential to dramatically alter the geographic distribution of major vegetation types—savannas, forests, and climate change can also potentially alter global ecosystem processes, including the cycling of carbon, nitrogen, phosphorus, and sulfur. Moreover, changes in these ecosystem processes can affect and be affected by changes in the plant species of the ecosystem and vegetation type. All of the climate change—induced alterations of natural ecosystems affect the services that these ecosystems provide to humans.
The global average surface temperature increase of half a degree. Celsius observed over the past century has been in part due to differential changes in daily maximum and minimum temperatures, resulting in a narrowing of the diurnal temperature range. Decreases in the diurnal temperature range were first identified in the United States, where large-area trends showed that maximum temperatures have remained constant or increased only slightly, whereas minimum temperatures have increased at a faster rate. In this issue, Alward et al report on the different sensitivities of rangeland plants to minimum temperatures increases.
Which of the following is NOT mentioned as a reason for the global warming？
A．In effectB．ConsequentlyC．In a senseD．However
A．but ratherB．orC．or elseD．but
企业将其按照销售商品、提供劳务的销售合同所产生的应收债权出售给银行等金融机构，在进行会计核算时，应按照“实质重于形式”的原则，充分考虑交易的经济实质。对于有明确的证据表明有关交易事项满足销售确认条件，如与应收债权有关的风险、报酬实质上已经发生转移等，应按照出售应收债权处理。()
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