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【简答题】
图a所示为一简易冲床的初拟设计方案。设计者的思路是：动力由齿轮1输入，使轴A连续回转；而固装在轴A上的凸轮2与杠杆3组成的凸轮机构。将使冲头4上下运动以达到冲压的目的。试绘出其机构运动简图，分析其是否能实现设计意图，并提出修改方案。 图a
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【简答题】An instrument to
measure the acceleration of gravity on Mars is constructed of a spring
from which is suspended a mass of 0.24(kg). At a place on earth where the
local acceleration of gravity is 9....
【单选题】The acceleration of a projectile is:
A.
g
B.
-g
C.
0
D.
dependent on its initial velocity
【单选题】The direction of the acceleration of the block (after leaving the ramp) at position R is best represented by which of the arrows in the diagram?
A.
Arrow 2
B.
Arrow 3
C.
Arrow 5
D.
Arrow 6
E.
None of the arrows, the acceleration is zero.
【简答题】An instrument to measure the acceleration of gravity on Mars is constructed of a spring from which is suspended a mass of 0.24(kg). At a place on earth where the local acceleration of gravity is 9.80(...
【单选题】To the author E-mail is______.
A.
the authority on the acceleration of life pace
B.
the essence of life
C.
both the catalyst and the instrument of the change in human interaction
D.
the living embodiment of human connection in all areas
【单选题】Orbits decay due to ______.
A.
the acceleration of the spacecraft
B.
the crash with small amounts of air molecules
C.
the invention and application of solar sails
D.
the existence of air molecules
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