【答案】A【核心短语/词汇】at the top of 在...的顶部;in the air 在空气中;little oxygen 几乎没有氧气【翻译】在高山的顶部,空气中几乎没有氧气。【解析】根据句意,在高山的顶部,空气中 氧气。常识判断,高山顶部高原地方缺氧,形容氧气很少。A little 几乎没有,修饰不可数名词。B few 几乎没有,修饰可...
At the top of the high mountains, there is very ___ oxygen in the air. A. a little B. little C. a few D. few 答案 B 【解析】 试题分析:句意: 在高山顶上,空气中有少量的氧。few, a few是可数的, little, a little是不可数的。 few 和little表示很少,否定的意思。a few 和a litt...
The enzymatic oxidation of methane to methanol was discovered in methanotrophs over 110 years ago. Nevertheless, the mechanism of action of particulate methane monooxygenase (pMMO) remains elusive, especially regarding O2 activation and the nature of the
Much of the current volume of Earth’s continental crust had formed by the end of the Archaean eon1 (2.5 billion years ago), through melting of hydrated basaltic rocks at depths of approximately 25–50 kilometres, forming sodic granites of the tonalite–trondhjemite–granodiorite (TTG) suite2,...
We calculate charge transition levels of various defects at the SiC/SiO${}_{2}$ interface within a scheme based on hybrid density functionals, which accurately reproduce the involved band gaps and band offsets. The defect levels are first evaluated in bulk models of the interface components and...
The air-liquid interface is a selectively advantageous niche for aerobes due to the accessibility to oxygen. Various species of aerobes form a biofilm-like structure at air-liquid interfaces, known as a pellicle. Although the pellicle is one of the major growth modes of microorganisms, the meta...
The considerable δ18O drifting quantity also reveals that there is the strong water-rock interaction in Huayin section of the Gushi depression zone. Because of the enclosed geological environment, the geothermal water is recharged by the sources at a low temperature. At the same time, the deplet...
However, these descriptors are difficult to understand the orientation-dependence and differences of ORR activity at the same Fe-N4 site on different carbon supports11,12,14. Therefore, elucidating the origin of ORR activity and exploring the universal descriptors of ORR activity on the Fe-N4 site...
Surfaces, interfaces and grain boundaries are classically known to be sinks of defects generated within the bulk lattice. Here, we report an inverse case by which the defects generated at the particle surface are continuously pumped into the bulk lattice
It has been found that, at the reduced CeO2(111) surface, the adsorption strength of H as well as the H coupling barrier can be dramatically reduced compared to those at the stoichiometric surface, while H2O formation barrier is not significantly affected. Moreover, the diffusion of H at ...