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【简答题】
田间试验设计中，完全随机设计适用的试验环境是（ ）;随机区组设计适用的试验环境是（ ）。
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皮皮学刷刷变学霸
举一反三
【单选题】If a university charged a lower price for tuition during summer school than during the regular session, in search of added total revenue,
A.
administrators likely believe that demand is more elastic during summer school than during the regular session.
B.
administrators likely believe that demand is less elastic during summer school than during the regular session.
C.
it indicates nothing about likely differences in the elasticity of demand during summer school than during the regular session.
D.
administrators likely believe that demand is both lower and less elastic during summer school than during the regular session.
【单选题】企业的采购部门根据过去和许多供应商打交道的经验，从供应商名单中选择供应商企业，并直接重新订购过去采购过的同类产业用品，这种产业购买者的行为类型属于（）
A.
直接重购
B.
修正重购
C.
新购
D.
连续重购
【简答题】looking for job during the summer and other students will ______
【单选题】It is during summer breaks that we first taste the satisfaction of work that ______ into hard currency.
A.
transfers
B.
translates
C.
transmits
D.
transplants
【简答题】（14分）回答下列问题： （1）构成原子的粒子有 、 和 ；整个原子不显电性的原因是 。 （2）构成物质的微观粒子有 、 和 等。例如：构成氧气的粒子是 、构成铁的粒子是 、构成氯化钠的粒子是 和 。 （3）下列物质：①氧气；②人体呼出的气体；③液氧；④空气中0.03%的稀有气体；⑤二氧化碳；⑥洁净的空气。其中属于纯净物的是 ；请选出一种混合物并说明其中的成分 。
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