What is the most common element in the human body?A、 CarbonB、 CalciumC、 HydrogenD、 OxygenAnswer: D 相关知识点: 试题来源: 解析 D 在人体中,最常见的元素按质量计算依次为氧(O)、碳(C)、氢(H)、氮(N)等。具体分析如下: - **选项A(碳)**:碳是构成有机分子的骨架(如蛋白质、脂肪、核酸...
What is the most common element in the human body? Elements: In the scientific context, elements can be viewed as variations of atoms that have a unique number of protons. An element is pure in the sense that is only comprised of one type of atom. Some examples are lithium, berylium, ...
The most common elements present in the crust of the Earth are: 01:35 The most abundant element in the earth crust is 01:19 The most abundant element in the earth crust is 02:10 The second most abundant element in the earth crust is 02:22 The most common elements present in the crust...
A bonus element, the fifth most common in the human body, is calcium, which makes up 1% to 2% of humans by mass. More than 99% of that calcium is found in the bones and teeth, according to the National Institutes of Health. Sign up for the Live Science daily newsletter now Get the...
In HTML, the most common elements are easily recognizable, such as p, table, span, a, and div. In XML languages, the elements are defined by the language’s Document Type Definition (DTD). Every single element in a document plays a part in its presentation. In CSS terms, at least as...
根据第三段第三句中的 “real places around Dorset into the plot(…多塞特郡的真实场景进入 情节)”可知,此处是指在小说中把多塞特郡周围的真实场景融入了情节,所以incorporated意为 “包含, 合并” 。故选A。 【6题详解】 细节理解题。根据第四段 “Hardy followed this with Far From the Madding Crowd, ...
And while battery-powered vehicles have significant consequences for natural resources—particularly cobalt, nickel, and lithium—hydrogen is the most common element in the universe.Producing hydrogen, however, is costly, and at present fuel-cell vehicles are less commercially viable than EVs in most...
2. Identifying Elements: In the universe, various elements exist, but we need to determine which one is the most prevalent. 3. Researching Elemental Composition: Through scientific studies and observations, it has been established that hydrogen is the most common element in the universe. 4. Quant...
Most Abundant Post-Transition Metal Aluminum, Al, is the third most common element in the Earth's crust with8.1 percentof the crust's mass. All the earth's aluminum is combined with other elements to form compounds, and it is never found as a lone element. Aluminum oxide (Al2O3), alu...
The most common mistake in machine design? Seeing the seals as the final piece. This is a instruction for rework and leaks. Here's how to avoid it.