问题
选择题
_________, athletes all over the world took part in the Winter Olympics held in Vancouver.
A.Honored and excited
B.Honored and excitedly
C.Honoredly and exciting
D.Honoredly and excitedly
答案
答案:A
_________, athletes all over the world took part in the Winter Olympics held in Vancouver.
A.Honored and excited
B.Honored and excitedly
C.Honoredly and exciting
D.Honoredly and excitedly
答案:A
滑轮组机械效率的实验中:
(1)实验原理是______.
(2)直接测得的物理量是_______、______、______、______.
(3)实验中应选用的测量工具是______.
(4)测量时,必须______拉动弹簧测力计.
(5)在“测滑轮组机械效率“的实验中,用同一滑轮组进行了两次实验,实验数据如下:
次数 | 钩码重G/N | 上升高度h/cm | 弹簧测力计示数F/N | 绳头移动距离s/cm |
1 | 2 | 10 | 0.8 | 40 |
2 | 5 | 5 | 1.5 | 20 |