5) With respected to the load effects, which combination of the followings is used to calculate the maximum deflection of RC flexure member ( ). A. standard combination of loads%; B. frequency combination of loads; C. quasi-permanent combination of loads ; D. accidental combination of loads. 6) For doubly reinforced RC beam, which statement is the applicable requirement of the bearing capacity calculation formulas for the balanced failure type ( ). A. x3 2 a¢and B. x£ 2 a¢and X£X, ; x 3 C. x3 2acand X£X, ; D. x£ 2 a¢and 7) What is the most effective influencing factor for the oblique section bearing capacity of concrete beam without web reinforcements (). A. stirrup ratio; C. shear span ratio; B. longitudinal reinforcement ratio; D. cover concrete width

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HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.