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What force is responsible for the formation of the...
Single Choice
What force is responsible for the formation of the Earth from the planetary nebula?
A.
Strong force
B.
Weak force
C.
Electromagnetic force
D.
Gravity
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[单选题] Karst topography refers to landscapes that have been shaped by what agent of erosion?
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[单选题] An object's specific gravity is determined by which of the following?
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