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【简答题】
向量a的坐标为(1,2,3),向量b的坐标为(2,4,m),又已知这两个向量平行,则m=
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皮皮学刷刷变学霸
举一反三
【简答题】A．abilities B．qualities C．powers D．possibilities
【简答题】在诸多生态因子中,使生物的耐受性____或____极限时,生物的生长发育、生殖、活动和分布等直接受到限制,甚至死亡的因子,叫做____。
【单选题】For a self-sufficient producer, the production possibilities frontier
A.
is the same as the consumption possibilities frontier.
B.
is greater than the consumption possibilities frontier.
C.
is less than the consumption possibilities frontier.
D.
is always a straight line.
【单选题】Which procedure will generate the "Edge effect" in the TLC experiment?
A.
Poor spotting
B.
Poor saturation
C.
Unsuitable developing solvents
D.
Poor TLC plate itself
【单选题】A relationship that shows the technological possibilities for an economy as a whole is called a
A.
production function.
B.
utility possibilities frontier.
C.
production possibilities frontier.
D.
budget constraint.
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