Bắt bóng bật bảng-（H87.CC）-Bắt bóng bật bảng->>h87.cc<<-3t1a.html

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.