意识作为客观存在的主观映象说明
A.物质第一性、意识第二性 B.意识和客观存在的同一性C.意识对物质的根源性 D.物质对意识的根源性
参考答案:A,B,D
用鸡胚增殖禽流感病毒的最适接种部位是()
A.胚脑
B.羊膜腔
C.尿囊腔
D.卵黄囊
E.绒毛尿囊膜
A firm in a perfectly competitive market will tend to expand its output as long as:()
A. its marginal revenue is positive.
B. the market price is greater than the marginal cost.
C. its marginal revenue is greater than the market price.