皮皮学，免费搜题
登录
搜题
【单选题】
下列关于运动物体的合力做功和动能、速度变化的关系,正确的是 ( ) A . 物体做变速运动,合外力一定不为零,动能一定变化 B . 若合外力对物体做功为零,则合外力一定为零 C . 物体的合外力做功,它的速度大小一定发生变化 D . 物体的动能不变,所受的合外力必定为零A.
a
B.
b
C.
c
D.
d
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】— How far is it from your home to the market? — _____________________ [ ]
A.
It's seven years old.
B.
It's about five kilometres.
C.
It is fine.
【单选题】It’s helpful to put students in a situation _______ they can learn how to cooperate with each other.
A.
that
B.
when
C.
where
D.
which
【单选题】She's such an irritating woman, and I don't know how you can ______ her.
A.
put up
B.
put up with
C.
stand up with
D.
stand with
【单选题】It’s helpful to put students in a situation _______ they can learn how to cooperate with each other.
A.
that
B.
when
C.
which
D.
where
【单选题】_______ the fact that he _______ speak English, he spent quite a pleasant time in London.
A.
Although; can’t
B.
Despite; couldn’t
C.
In spite of; can’t
D.
Though; couldn’t
相关题目：
参考解析：
知识点：
题目纠错 0
发布
