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根据劳动合同法律制度的规定，下列情形中，用人单位既不得解除劳动合同，也不得终止劳动合同的有（）。
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在土壤的形成过程中，具有明显的脱硅富铝化和生物富集过程的土壤是（）。
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倾角＞30°采煤工作面，必须制定专门的安全技术措施。
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Every country has traffic rules and signs, but are they the same? In most countries, there are street and road signs with 21________ about location,directions,dangers,cautions, and rules of the road. These 22 _________ tell drivers and pedestrians what to do and what not to do,including speed and parking 23 ________,places to stop,when to make turns,and other 24________.However, specific local traffic laws and practices usually differ around the world. For instance, in Japan, Indonesia, South Africa, the United Kingdom, and other countries ,steering 25________are on the right side of vehicles ,and cars and trucks drive on the left side of the road. In other 26 _________,such as the United States,Saudi Arabia,Italy, and Mexico,steering wheels are on the left side of vehicles ,and cars and trucks 27________on the right side of the road. An illustration of a local 28________law is the regulations for pedestrian and school 29 ________ in some Mexican cities:drivers rarely respect the rules,so for safety, people cross streets only at stop lights, on roads with little traffic, or on pedestrian-only 30 _________ across wide avenues.
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下列说法正确的是()
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MMH中，粘土颗粒与正电胶、复合体与复合体之间，加了一层或多层水分子，凝胶强度（）。
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燃烧必须有几个条件，这几个条件缺任何一个，燃烧都不能发生，因此将它们称为燃烧要素。燃烧要素为＿。
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债权人会议的职权包括（）、（）（）。
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若堤防运行期间出现接缝渗漏，可采取（）截渗措施。
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当建筑基坑侧壁的安全等级为一级时，基坑的重要性系数应取（）。