问题
选择题
如图所示，一个质量为M的倒“日”字木框中间套有一质量为m的圆环静止放在水平面上，现给圆环一向上初速度v，当圆环向上运动过程中，木框恰好对地面无压力，则此时圆环的加速度为
A．0
B．g
C．Mg/m
D．(m+M)g/m
答案
答案：D
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如图所示，一个质量为M的倒“日”字木框中间套有一质量为m的圆环静止放在水平面上，现给圆环一向上初速度v，当圆环向上运动过程中，木框恰好对地面无压力，则此时圆环的加速度为
A．0
B．g
C．Mg/m
D．(m+M)g/m
答案：D
Mascots(吉祥物)for the Olympic Game
| ||||||||||||||||||||||||||||||
| 1.From the information above,we know the Olympic Games is held every ________ years. | ||||||||||||||||||||||||||||||
| A.3 B.4 C.5 | ||||||||||||||||||||||||||||||
| 2.The mascots for Beijing Olympic Games are 2 more than those for ________ Olympic Games. | ||||||||||||||||||||||||||||||
| A.Sydney B.Los Angeles C.Atlanta | ||||||||||||||||||||||||||||||
| 3.The mascot for the ________ Olympic Games was the first Olympic mascot in Olympic history. | ||||||||||||||||||||||||||||||
| A.1996 Munich B.1984 Beijing C.1972 Munich | ||||||||||||||||||||||||||||||
| 4.The 23rd and 26th Olympic Games were held in the same ________. | ||||||||||||||||||||||||||||||
| A.town B.city C.country | ||||||||||||||||||||||||||||||
| 5.Which of the following information is NOT true? | ||||||||||||||||||||||||||||||
| A.The 1996 Olympic Games was held in America. B.The 27th Olympic Games was held in Europe. C.Beijing is getting ready for the 29th Olympic Games. |
