皮皮学，免费搜题
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【多选题】
对摄影师而言,光线具有的 三个主要特性是A.
质量
B.
强度
C.
密度
D.
颜色
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Economists use theories to:
A.
abstract from the complexities of the world.
B.
understand economic behavior.
C.
explain and help predict human behavior.
D.
do all of the above.
【单选题】Economists use assumptions to:
A.
make things simple
B.
focus on what really matters
C.
simplify decision-making
D.
all of the above
【单选题】Economists use assumptions:
A.
to make the real world easier to understand.
B.
to make their models more accurately reflect the real world.
C.
to make their models more complex.
D.
to make it more difficult to understand how the real world operates.
【简答题】你如果想测量你的同桌的反应时间,你握住尺子的上端,同桌的手放在尺的下端零刻度处待命,当同桌看到你的手松开时,迅速握住尺子,他的手握在 20cm 处,同桌的反应时间为多长?若招飞时对飞行员的反应时间要求达到 0.16s ,同桌能当飞行员吗?( g 取 10m / s2 )
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