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公安机关为了维护社会治安秩序和公共安全，依法向负有特定义务的人发出作为、不作为和约束的指令，称之为“警察命令”。 ( )
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心材由于生长年久，故坚硬性比边材好。
Asia Star, a monthly magazine based in Singapore, is looking for a Design Editor to run the publication’s art department. The art department primarily creates maps, charts, illustrations (插图) and graphics (图表) for the news sections. Asia Star is printed in some major Asian cities: Hong Kong, Bangkok (曼谷), Singapore, Tokyo, etc. and also distributed around the world.
房屋建筑按使用性质分为工业建筑、农业建筑、居住类建筑。
马尾松产于我国的松花江流域。
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