China has signed cooperation agreements with some countries on fiber optic cables, which represent the practical launch of the Silk Road Fiber Optic Cable project.

Up to now, for information transmission, significant progress has been made in the construction of cross-border fiber optic cables between_______.

In a data communication system, the transport media with the widest frequency band and best reliability is the( ). A: radio channel B: coaxial cable C: twisted--pair cable D: fiber optic cable

（）是光纤通讯、电机工程专家，被华文媒体誉之为“光纤之父”、普世誉之为“光纤通讯之父”（Father of Fiber Optic Communications）。

In May 2017， on the first BRF for international cooperation， President Xi said： We should strengthen cooperation in frontier areas， such as digital economy and so on， linking them into the _______ .（ ） A: digital Silk Road of the 21st century B: big data Silk Road C: Online Silk Road D: Silk Road Fiber Optic Cable

The phenomenon of shrinkage and swelling of wood occurs in A: below fiber saturation point. B: above fiber saturation point. C: above or below the fiber saturation point. D: no correlation with fiber saturation point.

Which one has the function of defense and protection A: Matrix B: Collagen fibril C: Collagen fiber D: Elastic fiber E: Reticular fiber

Fruits are a good source of which nutrients? A: Vitamins, carbohydrates, and minerals B: Fats, carbohydrates and fiber C: Minerals, vitamins, and fiber D: Protein, fiber, and vitamins

For fabrication of fiber reinforced composite, in which one weak<br/>interface is desired to ensure the composite possess high toughness.(<br/>) A: Carbon fiber reinforced titanium. B: Carbon fiber reinforced carbon composite. C: Glass fiber reinforced polymer.

It is said that synthetic fiber (合成纤维) is not as good as natural fiber. Natural fiber is said to be __________ synthetic fiber. (superior)