【简答题】(本小题满分12分)品厂为了检查甲、乙两条自动包装流水线的生产情况,在这两条 流水线上各抽取40件产品作为样本称 出它们的重量(单位:克),重量值落在(495,510] 的产 品为合格品,否则为不合格品,表1是甲流水线样本频数分布表, 图1是乙流水线样 本的频率分布直方图。 某食 (1)若检验员不小心将甲、乙两条流水线生产的重量值在(510,515]的产品放在了一起, 然后又随机取出3件产品,求至...
【单选题】The first well to produce oil in China is located in
【判断题】China is located in relatively enclosed geographical surroundings.
【单选题】China is located in .
【判断题】China is located in relatively enclosed geographical surroundings. In the north stretches the vast Gobi desert and prairie.
【判断题】China is located in the South east Asian sub-area