A:you pretend
B:you to pretend
C:of you to pretend
D:your pretending
实验次数
1
2
3
钩码重G/N
4
6
钩码上升高度h/m
0.1
绳端拉力F/N
1.8
1.4
2.4
绳端移动距离s/m
0.3
0.5
机械效率η
74%
57%
83%
The doctor had almost lost hope at one point, but the patient finally ______.