Thepriceelasticityofsupplymeasureshowmuch
A. the quantity supplied responds to changes in input prices.
B. the quantity supplied responds to changes in the price of the good.
C. the price of the good responds to changes in supply.
D. sellers respond to changes in technology.
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Becausethedemandforwheattendstobeinelastic,thedevelopmentofanew,moreproductivehybridwheatwouldtendto
A. increase the total revenue of wheat farmers.
B. decrease the total revenue of wheat farmers.
C. decrease the demand for wheat.
D. decrease the supply of wheat.
G-菌细胞壁含有
A. 细胞膜
B. 异染颗粒
C. 外膜
D. 膜磷壁酸
E. 中介体
革兰阳性细菌下述哪一项是错误的
A. 细胞壁主要成分是肽聚糖
B. 肽聚糖层外有脂蛋白,外膜及脂多糖
C. 对青霉素敏感
D. 产芽胞的细菌都是革兰阳性细菌
E. 有些革兰阳性细菌能产生外毒素
属于专性需氧菌的是
A. 葡萄球菌
B. 肺炎双球菌
C. 结核杆菌
D. 伤寒杆菌
E. 大肠杆菌
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