皮皮学，免费搜题
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【判断题】
抽样过程包括确定抽样方案和取样，抽样应确保科学、公正，所抽取样品应有代表性，并保持完整。（ ）A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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【简答题】What should you do if your iron starts to drip water?
【单选题】Do you know _______________? [ ]
A.
whether we should water the flowers
B.
whether should we water the flowers
C.
should we whether water the flowers
D.
whether we had watered the flowers
【单选题】听力原文： We all scream for water when thirsty. But do you know But do you know in very hot dry weather, plants also make faint sounds as if they cry out for help? You see, in a plant's stem, there are hu...
A.
They give out faint cries.
B.
They make noises to drive away insects.
C.
They extend their water pipes.
D.
They become elastic like rubber bands.
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