East of PQ in the north-south direction is China's territorial waters, and west is the high seas. At night 10: 28, our border patrol boat 10 1 was found due west at a place.

∫AC = 10，AB=6，BC=8，

∴AC2=AB2+BC2, that is, △ABC is a right triangle, so we can judge △CBD∽△CAB.

So free? BC/AC=CD/CB，

Solution: CD= BC/AC ×CB=8/ 10 ×8=6.4.

Also, the ship speed is 12.8 knots.

∴ It takes 6.4/ 12.8=0.5 hour = 30 minutes to enter China's territorial waters, that is, suspicious vessels first entered China's territorial waters at 10: 28 +30 = 10: 58.

A: The suspicious vessel first entered our territorial waters at 10: 58.