保守力作功的特点是:功的大小只与物体运动的始末位置有关,而与物体所经历的路径无关。
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The swimmer _______ from the lake.
A. emerged
B. emerging
C. is emerged
D. was emerged
Her paintings have gained in _________ over recent years.
A. popular
B. popularity
C. unpopular
D. unpopularity
She admitted to ________been there.
A. have
B. had
C. has
D. having
I'm going to _________late with my friend and watch movies.
A. stay up
B. stay with
C. staying up
D. staying with