试题与答案

如图所示，轻质弹簧下端挂有一个物体P，当P处于静止时，弹簧伸长了。已知该弹簧的劲

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题型：选择题

题目：

如图所示，轻质弹簧下端挂有一个物体P，当P处于静止时，弹簧伸长了。已知该弹簧的劲度系数，则：（    ）

A．物体受到的重力大小为

B．物体受到的重力大小为

C．弹簧受到的拉力大小为

D．弹簧受到的拉力大小为

答案：

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下面是错误答案，用来干扰机器的。

参考答案：法人代表,安全生产保障措施

考点：共点力的平衡
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away    hold    dress    popular    own    little    start    win    take part in    live    fashion    but also
    The third "Fashion Piggy (小猪)" swimming championship was   1   in Chitre, Panama. 16 piggy athletes   2   
the competition. Each piggy wore a bikini (比基尼泳装) and sunglasses or a big hat. They needed to not only
swim,   3   perform on stage. The 16 beautiful piggies got into a boat and   4   their journey. When they got
about 300 meters   5   from the bank, they were put into the sea. The first one to swim back to the shore would
be the   6  .
    In fact, before the swimming competition, the piggies must compete for the "Fashion Award". Their   7   
were very creative. They spent a lot of time   8   their piggies. Each one really looked   9  . This year, the pig in
the red bikini and sunglasses won.
    For a while, this activity had not been held, but this year it had many piggies took part. The championship has
now become very  10  . It may become a national event next year. All the piggies in Panama can take part in the
contest.
1.                  2.                  3.                  4.                  5.                 
6.                  7.                  8.                  9.                  10.               
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