皮皮学，免费搜题
登录
搜题
【单选题】
如图所示,有一劲度系数为k的轻弹簧竖直放置,下端悬一个质量为m的 小球,开始时使弹簧为小球恰好与地接触,今将弹簧上端缓慢提起,直 到小球刚能脱离地面为止,在此过程中外力做功为 ( )
A.
;
B.
;
C.
;
D.
。
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
【单选题】Try to guess the meanings of the underlined words. Two s have highlighted (made people notice and think about) the tensions in recent days.
A.
eased
B.
stressed
C.
helped
查看完整题目与答案
【判断题】The symbolic meanings contained in the design of Han Fu always reminds us of our responsibilities to the people and the country.( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】某工程桩基采用钢筋混凝土方桩 300mm × 300mm ,共两节每节长 5m ,预制桩 尖 0.3m ,则打桩工程量为( )。
A.
5m
B.
0.927 m3
C.
10m
D.
10.3 m3
查看完整题目与答案
【单选题】提高( ),以减少农药残留和对环境的污染。。
A.
喷施效率
B.
喷施速率
C.
作业效率
D.
作业速度
查看完整题目与答案
【简答题】The Meanings of Dreams Sleep and dreams have interested people for centuries. Scientists are learning more about sleep, but they still know very little about why we dream. 小题1: First, we have most of ...
查看完整题目与答案
【判断题】Good design has low cohesion and high coupling. ( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Which grammatical cohesion strategy has been used in the following paragraph? I see traces of the turtle soup, and vension, and gold spoon in this. Yes, I do! Cried Mr. Bounderby, shaking his head wit...
A.
ellipsis
B.
conjunction
C.
reference
D.
substitution
查看完整题目与答案
【判断题】Good design has low cohesion and high coupling.
A.
正确
B.
错误
查看完整题目与答案
【判断题】A good paragraph has unity, coherence and cohesion; a good essay also has these features.
A.
正确
B.
错误
查看完整题目与答案
【多选题】按2010标准,以工业企业为例,以下不属于小型企业的是( )。
A.
从业人员1000人以上或营业外收入40000万元以上
B.
从业人员300人员及以上1000人以下，营业收入2000万元及以上40000万元以上为
C.
从业人员20人及以上300人以下，且营业收入300万元及以上2000万元以下
D.
从业人员20人以下或者营业收入300万元以下
查看完整题目与答案
相关题目：
【单选题】Try to guess the meanings of the underlined words. Two s have highlighted (made people notice and think about) the tensions in recent days.
A.
eased
B.
stressed
C.
helped
查看完整题目与答案
【判断题】The symbolic meanings contained in the design of Han Fu always reminds us of our responsibilities to the people and the country.( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】某工程桩基采用钢筋混凝土方桩 300mm × 300mm ,共两节每节长 5m ,预制桩 尖 0.3m ,则打桩工程量为( )。
A.
5m
B.
0.927 m3
C.
10m
D.
10.3 m3
查看完整题目与答案
【单选题】提高( ),以减少农药残留和对环境的污染。。
A.
喷施效率
B.
喷施速率
C.
作业效率
D.
作业速度
查看完整题目与答案
【简答题】The Meanings of Dreams Sleep and dreams have interested people for centuries. Scientists are learning more about sleep, but they still know very little about why we dream. 小题1: First, we have most of ...
查看完整题目与答案
【判断题】Good design has low cohesion and high coupling. ( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Which grammatical cohesion strategy has been used in the following paragraph? I see traces of the turtle soup, and vension, and gold spoon in this. Yes, I do! Cried Mr. Bounderby, shaking his head wit...
A.
ellipsis
B.
conjunction
C.
reference
D.
substitution
查看完整题目与答案
【判断题】Good design has low cohesion and high coupling.
A.
正确
B.
错误
查看完整题目与答案
【判断题】A good paragraph has unity, coherence and cohesion; a good essay also has these features.
A.
正确
B.
错误
查看完整题目与答案
【多选题】按2010标准,以工业企业为例,以下不属于小型企业的是( )。
A.
从业人员1000人以上或营业外收入40000万元以上
B.
从业人员300人员及以上1000人以下，营业收入2000万元及以上40000万元以上为
C.
从业人员20人及以上300人以下，且营业收入300万元及以上2000万元以下
D.
从业人员20人以下或者营业收入300万元以下
查看完整题目与答案