Cov Menyuam Roj Hmab Sib Tsoo Pob Zeb Sib Tsoo Lub Taub Hau

Kev piav qhia txog khoom
1. Nws tau teeb tsa rau ntawm lub tshuab dhos dav dav kom sib tsoo cov roj hmab roller.
2. Siv cov log sib tsoo pob zeb los sib tsoo cov roj hmab.
3. Qhov ceev tshaj plaws yog 27m / s.

Cov Kev Pabcuam
1. Kev pabcuam teeb tsa hauv tsev kawm ntawv tuaj yeem xaiv tau.
2. Kev pab txij nkawm rau lub neej ntev.
3. Kev txhawb nqa online siv tau.
4. Cov ntaub ntawv kev txawj ntse yuav muab.
5. Kev pabcuam cob qhia tuaj yeem muab tau.
6. Kev hloov khoom seem thiab kho khoom seem tuaj yeem muab tau.