问题
选择题
—Let's play soccer.
—______. [ ]
A. Yes, I do
B. That sounds good
C. No. It's on the desk
D. Yes, it is
答案
答案：B
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—Let's play soccer.
—______. [ ]
A. Yes, I do
B. That sounds good
C. No. It's on the desk
D. Yes, it is
答案：B
，x为弹簧形变量，求整个过程中小物体A克服摩擦力年做的总功W。