THE TELESCOPE WAS DESIGNED TO DISTINGUISH BETWEEN RANDOM SIGNALS A...

69. - BAI TAP TRAC NGHIEM TIENG ANH TONG HOP LEVEL A
BAI TAP TRAC NGHIEM TIENG ANH TONG HOP LEVEL A

69. The telescope was designed to distinguish between random signals and ________ which might be in

code.

a. these b. those c. ones d. them