问答题

Which of the following may be used in cleaning up an oil spill without the permission of governmental authities 2分 A Straw Skimmers only B Skimmers Chemical dispersants only C Straw Ch

答案：答案：A 解析：选项A中的Straw Skimmers（稻草撇油器）是一种物理方法，用于清理水面的油污。由于它...

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Sanitary stm valves to be dismantled cleaned ground coated with then refitted in der

答案：答案：Sanitary steam valves to be dismantled, cleaned, ground, ...

is the actual amount of water vapour in the air compared with the saturation 饱和 amount of water vapour in the air at the same temperature pressure the figure is usually expressed as a percentage

答案：答案：是的，实际水蒸气含量与相同温度和压力下空气的饱和水蒸气含量的比较通常以百分比的形式表示，这个比值被称为相对湿度（R...