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【单选题】
活塞环组装前,应将其放在汽缸内作检查,一般要求透光不应超过两处,每处透光弧度不得超过( )。A.
30°
B.
25°
C.
45°
D.
15°
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反馈参考答案：
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。
【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.
【简答题】A．abilities B．potentials C．capabilities D．possibilities
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