下列调查中,调查方式选择正确的是()
A.为了了解100个灯泡的使用寿命,选择全面调查
B.为了了解某公园全年的游客流量,选择抽样调查
C.为了了解生产的50枚炮弹的杀伤半径,选择全面调查
D.为了了解一批袋装食品是否含有防腐剂,选择全面调查
正确答案是B
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