挑战习题
1/5单选题
难度:

1.

力臂就是(  )


A

杠杆的总长度

B

支点到杠杆一端的距离

C

支点到力的作用线的距离

D

动力到阻力的距离

提示1:
PHA+54K55Yiw5Yqb5L2c55So57q/55qE6Led56a7PC9wPg==
提示2:
PHA+5Yqb6IeC5piv5pSv54K55Yiw5Yqb5L2c55So57q/55qE6Led56a744CCPGJyPjwvcD4=
提示3:
PHA+5Lqy77yM6L+Y5LiN5Lya5LmI77yfPC9wPg==
正确答案:Qw==
PHA+5Yqb6IeC5piv5pSv54K55Yiw5Yqb5L2c55So57q/55qE6Led56a744CCPGJyPjwvcD4=