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此图为中国人民防空标志。中国人民防空标志经***、******批准，自1999年5月1日起沿用。此标志由图片和文字组成，基本含义是中国人民防空。文字“CCAD”是Chinese civil air defence(中国人民防空)的英文缩写。长城象征中华人民共和国，并寓意人民防空是国防的重要组成部分，是中国的地下长城。