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【单选题】
建立的自然保护区的主要原因是对生物多样性进行 [ ]A.
生态旅游
B.
迁地保护
C.
就地保护
D.
控制管理
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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
【简答题】粒子类型中 的参数设置可以参照发射器类型中的图层设置原理。
【简答题】将下列英文翻译成中文。 A western blot (immunoblot) of antigens separated from a complex mixture by SDS-PAGE( or by isoelectric focusing) can be carried out. This employs transverse electrophoresis on yo polyviny...
【简答题】A．abilities B．potentials C．capabilities D．possibilities
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