问题
选择题
—Can you speak English, Mr. Wang?
—Yes, but only _______. [ ]
A. a few
B. few
C. a little
D. little
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—Can you speak English, Mr. Wang?
—Yes, but only _______. [ ]
A. a few
B. few
C. a little
D. little
答案：C
，AB=h，小球滑到B点时速度大小为
。求：