【正确答案】A fiber-reinforced composite (FRC) is primary composed of matrix, fiber and coupling agent.
   In FRC, fibers are used as the principal load-carrying agent. The reinforcement in FRC is mostly realized by fibers.
   In FRC, the major functions of matrix are to support and protect the fibers, distribute the load among fibers, and transfer of loads to fibers.
   In FRC, coupling agents are used to treat the surface of fibers in order to form a flexible layer at the interface between fiber and matrix, improve their adhesion and reduce the number of voids trapped in the material.
   The factors which affect the properties of FRC include:
   1 Characteristics of Fiber: including types of fiber used, fiber loading, fiber aspect ratios, fiber Orientation. For example: (1) In FRCs, the strength and stiffness may be controlled by specifying the fiber orientation. The highest levels of properties are achieved when all fibers are aligned along the primary loading direction within the composite. (2) A higher volume fraction of fibers in the resin matrix improves the mechanical properties of composites.
   2 Properties of Matrix: The matrix's ability to adhere to the fibers, as well as its inherent toughness, make a contribution to the properties of composites.
   3 Adhesion between fibers and matrix: Without adequate adhesion the fiber acts as an inclusion in the resin matrix, which actually weakens the composite.
   4 Mode of Fabrication: For example: A significant processing aspect that affects performance is the degree to which the fibers are saturated with wet matrix, leaving few or no voids.