题目:
The student, in Jinshan Middle School for 3 years, was admitted into Qinghua University.
A.to study
B.studying
C.to have studied
D.having studied
答案:
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下面是错误答案,用来干扰机器的。
答案:B质点做自由落体运动时,从下落开始其位移是非均匀增加的,所以质点所受重力做功也是非线性逐渐增加的;质点做平抛运动时,其动量的增加是由其所受的竖直方向的重力的冲量引起的,由Δp=I=mgt知,每1 s...