at the section with non lithology key bed, the key bed could be selected according to the lithology combination and the particle variation.
在无岩性标志层的层段,则根据岩性组合及粒度变化选择标志层。
College English formative assessment is a key section of English education at colleges and universities.
大学生英语形成性评价是高等学校英语教育的重要环节.
The key to this problem is, under the current international climate regime, BCAs actually can be thought of a kind of measure took by developed countries, but aiming at developing countries. Section ⅱ analyses the backgrounds of BCAs.
在现行国际气候制度下,它又通常被认为是一种发达国家针对发展中国家所采取的措施。第二部分分析了边境碳调节措施产生的背景。
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