A.guard factories, warehouses and museums |
B.send loud, painful sirens when it is stolen |
C.sense moving objects and signal police |
D.move around and do the programmed work |
A.From a human guard. | B.From a built-in computer. |
C.From another robot. | D.From radio signals. |
A.New Guards. | B.Science and Technology. |
C.Alarm Systems. | D.Engineers and Robots. |