挑战习题
1/5单选题
难度:

1.

一架长10米的梯子,斜立在以竖直的墙上,这时梯足距墙底端6米,如果梯子的顶端沿墙下滑2米,那么梯足将滑(  )米


A

2

B

1

C

0.75

D

0.5

提示1:
PHA+5qC55o2u5p2h5Lu25L2c5Ye656S65oSP5Zu+77yM5qC55o2u5Yu+6IKh5a6a55CG5rGC6KejPC9wPg==
正确答案:QQ==
PGRpdj48aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvQjEvckJBQ0ZGTU1jUkx6SXpkSEFBQXVQRVducndVMzgwLnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8wMC9CMS9yQkFDRkZNTWNSTHpJemRIQUFBdVBFV25yd1UzODAucG5nIiBhbHQ9IiIgc3R5bGU9IndpZHRoOiA0NzdweDsgaGVpZ2h0OiAyNThweDsiPjwvZGl2Pg==