Why the fiber optic networks of DSL and/or cable providers actually go within a mile or so of many of the customers they serve. ( ).
A. Because they know that fiber optics are the most cost effective solution.
Because they know that by putting fiber close to the homes and businesses that they serve is good chance.
C. Because they know that they stand a very good chance of making the transition to an all-fiber network that much easier.
D. A, B and C.
查看答案
What isn’t the benefit which fiber optics bring to us ( ).
A. Green
B. Easy to upgrade
C. None signal degradation
D. More untapped overhead
Your ability to see light is based on ( ).
A. Planck’s constant.
B. Angular momentum.
C. Beam of light
D. A and B
What kind of breakthrough would be achieved if the new form of light is applied to the field of transmission field ( )?
A. Transmission function would be changed.
B. Data would be more secure.
C. More expensive.
D. A, B and C
What is the meaning of untapped overhead ( )?
A. Unused bandwidth
B. Resources without exploit.
C. Unconnected broadband
D. Hangout without wearing hat
微信支付 
支付宝支付