皮皮学,免费搜题
登录
搜题
【简答题】
Who wants to carry a bulky bag to school? No children. Nobody wants one shoulder to be lower than the other,and paining(疼痛)too. In India,most of us would look at the reduction(减少)of textbooks as a way out. But in a country like America,there are always more choices. A company called goReader has created a "school bag" which is the size of a laptop computer(笔记本电脑),weighing about 2. 5kg. The goReader has a color screen and can "hold" all the textbooks that a student may need, says a report in 6 The Asian Age? newspaper. The company plans to work closely with the publishers ( 出版商)of textbooks so that these books can be supplied on the Internet. All the students will have to do is to download(下载)their textbooks. Making notes and marking important parts of a lesson can be done just as lots of students have done on their textbooks before. At present, the plan is being tested out in a university. Richard Katzmann, the owner of the company is having his creation tested at Chicago? s DePaul University, where he studied. Does that mean it is goodbye to the newspaper, and the smell of the black ink?
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】剩余价值产生的唯一源泉是
A.
雇佣劳动者的剩余劳动
B.
雇佣劳动者的必要劳动
C.
雇佣劳动者的具体劳动
D.
雇佣劳动者的抽象劳动
【单选题】雇佣劳动者的( )劳动是剩余价值的唯一源泉
A.
剩余
B.
必要
C.
体力
D.
脑力
【简答题】在图示双滑块机构中,滑块1在驱动力P作用下等速运动。设已知各转动副中轴颈半径r=10mm,当量摩擦因数f v =0.1,移动副中的滑动摩擦因数f=0.176327,l AB =200mm。各构件的重量略而不计。当P=500N时,试求所能克服的生产阻力Q以及该机构在此瞬时位置的效率。
【多选题】在图示双滑块机构中,滑块1在驱动力P作用下等速运动,生产阻力为Q。各构件的尺寸,各转动副的半径及其当量摩擦系数,以及滑块与导路间的摩擦系数。(图中转动副处的细实线圆为摩擦圆)在正行程,以下分析正确的是( )。【图片】
A.
ω 23 沿顺时针方向。
B.
R 32 沿直线 x-x 向右下方。
C.
ω 21 沿逆时针方向。
D.
R 12 沿直线 t-t 向左上方。
【判断题】雇佣劳动者的剩余劳动是剩余价值的唯一源泉。
A.
正确
B.
错误
【判断题】雇佣劳动者的剩余劳动是剩余价值的唯一源泉。
A.
正确
B.
错误
【判断题】“母、丹、喜”可以按先外后内的规则书写。
A.
正确
B.
错误
【判断题】黑龙江省是中国纬度最高、经度最东的省份。
A.
正确
B.
错误
【多选题】在图示双滑块机构中,滑块 1 在驱动力 P 作用下等速运动,生产阻力为 Q 。设已知 各构件的尺寸,各转动副的半径及其当量摩擦系数,以及滑块与导路间的摩擦系数。(图中转动副处的细实线圆为摩擦圆)在正行程,以下分析正确的是( )。
A.
ω 23 沿顺时针方向。
B.
R 32 沿直线 x-x 向右下方。
C.
ω 21 沿逆时针方向。
D.
R 12 沿直线 t-t 向左上方。
【判断题】剩余价值的唯一源泉是雇佣劳动者的剩余劳动。
A.
正确
B.
错误
相关题目: