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Using radioactive elements found only in volcanic minerals, scientists have dated one nearby slab to a whopping 3.83 billion years ago, ranking it among the oldest rocks preserved on the earth's surface today.
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科学家利用只存在于火山矿物中的放射性元素,为邻近的一块石板定出年代︰38亿3000万年前,今日地表上留存的最古老岩石之一。 |
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Using radioactively labeled elements he demonstrated that the region of maximum absorption of water is a few centimeters behind the root tip and that quantities of minerals are absorbed passively in the transpiration stream.
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利用放射性标记元素证明了水分吸收的主要部位在根尖以上几厘米,矿物质随蒸腾作用被动的吸收入植物体内。 |
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Using radiocarbon techniques on sediments collected from four rivers, they determined that bacteria may alter riverine carbon, making it indistinguishable from ocean carbon.
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科学家以放射性碳技术研究收集自四条河流的沉积层,发现细菌可以改变河水里的碳,使它与海水里的碳无法区别。 |
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Using radiometric dating methods, Sugden determined that the ash settled into the fissure after a volcanic eruption 8.1 million years ago.
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使用放射性断代法,苏格丹发现火山灰早在810万年前的一次火山喷发后,就已进入了裂缝。 |
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Using randomized prospective trials in economic development policy is not new.
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在经济发展政策上运用「随机前瞻性试验」并非新鲜事。 |
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Using recklessness while drunk will make the effect last longer.
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喝醉时使用鲁莽将使效果持续时间更长。 |
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Using rectangular marquee tool create a border selection.
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使用矩形选择工具创建一个如下的选区。 |
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Using rectangular marquee tool create a selection covering all the shapes.
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使用矩形选区工具新建一个可以包围所有小矩形的选区。 |
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Using red and gold glitter acrylics, form a package. Cap with clear acrylic.
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用红色与金色亮片甲油画出包裹图案.再涂一层透明甲油. |
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Using refined cotton, chloroacetic acid, sodium hydroxide and hydrogen peroxide as main feedstock, sodium carboxymethyl cellulose was made by the process of basification, etherification, abstersion and drying.
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摘要以精制棉、氯乙酸、氢氧化钠和过氧化氢为原料,经过碱化、醚化、洗涤、干燥,制得羧甲基纤维素钠。 |
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Using regional geochemical exploration data, the authors figured Out moving window contrast values through window moving average operation, delineated single element anomalies and multi-element accumulative (multiplicative) anomalies according to contrast
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摘要利用区域地球化学勘查数据,经过窗口滑动平均,计算出滑动窗口的衬值,通过衬值圈定单元素和多元素累加(累乘)异常;在窗口滑动平均值基础上勾绘单元素和多元素背景曲线图、累加(累乘)多元素衬值异常和背景曲线图,制作找矿靶区定位预测图。 |