皮皮学，免费搜题
登录
搜题
【单选题】
关于功的概念有以下几种说法: (1) 保守力做正功时,系统内相应的势能增加.(2) 质点运动闭合路径,保守力对质点做的功为零.(3) 作用力和反作用力大小相等、方向相反,所以两者所做的功的代数和必然为零.在上述说法中
A.
(1)、(2)是正确的
B.
(2)、(3)是正确的
C.
只有(2)是正确的
D.
只有(3)是正确的
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【判断题】Both Albert Einstein and the author consider imagination more important than knowledge.
A.
正确
B.
错误
查看完整题目与答案
【单选题】色立体中同一色相面上的调和是
A.
同种色调和
B.
类似色调和
C.
对比色调和
D.
互补色调和
查看完整题目与答案
【判断题】( )为了增加老年人胃口,烹调时可采用干炸、烧烤等烹调方法。
A.
正确
B.
错误
查看完整题目与答案
【单选题】标准直齿圆柱齿轮分度圆直径d、基圆直径 d b 与压力角α三者的关系为( )。
A.
d b =dcosα
B.
d= d b cosα
C.
d d b =cosα
查看完整题目与答案
【简答题】Some of the world’s most famous persons had suffered from a similar disability, such as Albert Einstein, the mathematician; Thomas Edison, the inventor; Auguste Rodin, the artist. What disabled these ...
查看完整题目与答案
【单选题】By saying 'Stevie soon graduated from toy instruments to real instruments', the author means that________
A.
Stevie finished tiis study at a toy instruments school
B.
Stevie began to study in a real instruments school
C.
Stevie gave up all his toy instruments and began to buy many real instruments
D.
Stevie started to play real instruments
查看完整题目与答案
【单选题】习近平在中央外事工作会议上发表重要讲话强调:坚定维护国家主权、安全、发展利益,积极参与引领全球治理体系改革,打造更加完善的全球伙伴关系网络,努力开创中国特色大国外交新局面,用结伴但不结盟的全新实践诠释着中国特色大国外交理念。符合这一理念的观点有 :1独立自主巩固同盟 2和平发展主导世界 3平等互信合作共赢 4相互借鉴求同存异
A.
①②
B.
①③
C.
②④
D.
③④
查看完整题目与答案
【多选题】1现代人力资源管理的内容包括()。
A.
求才
B.
用才
C.
育才
D.
激才
E.
留才
查看完整题目与答案
【单选题】By saying 'Stevie soon graduated from toy instruments to real instruments', the author means that ______.
A.
Stevie finished his study at a toy instruments school
B.
Stevie began to study in a real instruments school
C.
Stevie gave up ail his toy instruments and began to buy many real instruments
D.
Stevie started to play real instruments
查看完整题目与答案
【单选题】The hard life in the mountainous area he has adapted to ____ a real challenge to anyone.
A.
mean
B.
means
C.
meant
D.
meaning
查看完整题目与答案
相关题目：
【判断题】Both Albert Einstein and the author consider imagination more important than knowledge.
A.
正确
B.
错误
查看完整题目与答案
【单选题】色立体中同一色相面上的调和是
A.
同种色调和
B.
类似色调和
C.
对比色调和
D.
互补色调和
查看完整题目与答案
【判断题】( )为了增加老年人胃口,烹调时可采用干炸、烧烤等烹调方法。
A.
正确
B.
错误
查看完整题目与答案
【单选题】标准直齿圆柱齿轮分度圆直径d、基圆直径 d b 与压力角α三者的关系为( )。
A.
d b =dcosα
B.
d= d b cosα
C.
d d b =cosα
查看完整题目与答案
【简答题】Some of the world’s most famous persons had suffered from a similar disability, such as Albert Einstein, the mathematician; Thomas Edison, the inventor; Auguste Rodin, the artist. What disabled these ...
查看完整题目与答案
【单选题】By saying 'Stevie soon graduated from toy instruments to real instruments', the author means that________
A.
Stevie finished tiis study at a toy instruments school
B.
Stevie began to study in a real instruments school
C.
Stevie gave up all his toy instruments and began to buy many real instruments
D.
Stevie started to play real instruments
查看完整题目与答案
【单选题】习近平在中央外事工作会议上发表重要讲话强调:坚定维护国家主权、安全、发展利益,积极参与引领全球治理体系改革,打造更加完善的全球伙伴关系网络,努力开创中国特色大国外交新局面,用结伴但不结盟的全新实践诠释着中国特色大国外交理念。符合这一理念的观点有 :1独立自主巩固同盟 2和平发展主导世界 3平等互信合作共赢 4相互借鉴求同存异
A.
①②
B.
①③
C.
②④
D.
③④
查看完整题目与答案
【多选题】1现代人力资源管理的内容包括()。
A.
求才
B.
用才
C.
育才
D.
激才
E.
留才
查看完整题目与答案
【单选题】By saying 'Stevie soon graduated from toy instruments to real instruments', the author means that ______.
A.
Stevie finished his study at a toy instruments school
B.
Stevie began to study in a real instruments school
C.
Stevie gave up ail his toy instruments and began to buy many real instruments
D.
Stevie started to play real instruments
查看完整题目与答案
【单选题】The hard life in the mountainous area he has adapted to ____ a real challenge to anyone.
A.
mean
B.
means
C.
meant
D.
meaning
查看完整题目与答案