参考答案: C 复制 纠错举一反三 {1}系指用于生物检定或效价测定的标准物质,其特性量值一般按效价单位计 查看完整题目与答案 李医生对患者进行腹腔穿刺,抽到不凝固血液,应考虑为 查看完整题目与答案 某混凝土梁的跨度为6.3m,采用木模板、钢支柱支模时,其跨中起拱高度可为__1__ 查看完整题目与答案 ...
Now scientists have managed to artificially transform one species into another by rearranging chromosomes. A team led by Professor Stephen Oliver of Manchester University has converted one species of yeast into another as part of an experiment that reveals much about how one species can become ...
Lizards that can outrun blazes. Birds that lay ash-colored eggs. Wildlife may have a limited ability to evolve in this fiery new era known as the Pyrocene.
not tissue- or cell-specific, this approach may not be sufficient to determine the specific tissue in which the expression is detected [7]. To overcome these challenges, the ideal solution is the isolation of specific tissues. In the case of secondary growth, it is possible to manually separa...
Great hub . . . informative and attractive. Yeah, I knew this and I grow a lot of plants. However, I had forgotten most of the "official" details that you so aptly covered. I am bookmarking this for my kids. What a great science fair project!
According to four articles published in the journal Nature in late September,Chinese researchers found fish fossils that provide the "missing link" about the origin of the jaw (下颌),a key trait (特征) that 99.8 percent of vertebrate species (脊椎动物) have. ...
Science has proven that our planet and species are facing a massive environmental crisis. How to Save Our Planet is a call to action, guaranteed to equip everyone with the knowledge needed to make change.Be under no illusion the challenges of the twenty-first century are immense. We need to...
to determine whether a cow is sick. Radio tags(标签) on the animals will measure temperature changes. The quality of grassland will be tracked by monitoring the shape, color and texture(质地) of grass. That way, cattlemen will know whether they need to move their cattle to another field ...
Is there an adaptive value to (9) intelligence That’s the question behind this new research. Instead of casting a wistful glance (10) at all the species we’ve left in the dust I.Q.-wise, it implicitly asks what the real (11) of our own intelligence might be. T...
Is there an adaptive value tointelligence? That's the question behind this new research. Instead of casting a wistful glance at all the species we've left in the dust I.Q.-wise, it implicitly asks what the real of our own intelligence might be. This is the...