氧气、乙炔和（）等压缩气瓶的外表面涂色以及有关警示标签应符合国家或行业有关标准的要求。 ["氦气","氮气","氩气","以上都是"]
（）行政组织体制的特征是多数的行政官员均系民选，有任期限制，体现民治，行政官员向民众负责。 ["官僚型","合法型","自治型","有效型"]
用户不得自行更换真空断路器的真空灭室上的零件。
感觉记忆
You are assigned the task of building a panel containing a TextArea at the top， a label directly below it，and a button directly below the label. If the three components are added directly to the panel. Which layout manager can the panel use to ensure that the TextArea absorbs all of the free vertical space when the panel is resized？（） [" GridLayout."," CardLayout."," FlowLayout."," BorderLayout."," GridBagLayout."]
叶绿体、线粒体的亚显微结构？
