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【多选题】
下列关于活性炭的历史说法错误的是( )。A.
公元前1550年埃及将活性炭用于医药。
B.
公元前1世纪印度将活性炭用于滤水。
C.
长沙马王堆出土的汉墓木棺用木炭吸潮防腐。
D.
在本草纲目中记述果壳烧炭可治疗心血管疾病。
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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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