题目内容

A) second B) latter C) other D) next

A. second
B. latter
C. other
D. next

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A) name B) idea C) expression D) image

A. name
B. idea
C. expression
D. image

A) many B) several C) some D) most

A. many
B. several
C. some
D. most

一个质量为m的重锤从高为h处自由落下，陷入地面的深度为s．在陷入地面的过程中，重力对锤所做的功为

A) performances B) operations C) functions D) workings:

A. performances
B. operations
C. functions
D. workings: