79. If your extension power cord at home is short-circuited, which device will most likely respond for safety？ (A)Voltage panel (B)Protection gauge (C)Circuit breaker (D)Electrical insulation

59. Which of the following statements about the structure is incorrect？ (A)The arch structure is well stressed, the disadvantage is that it takes up space. (B)The truss structure uses simple materials to withstand weight, and is often used to build bridges. (C)The cable structure is cheap and beautiful, and it is often used as the main structure of the building. (D)The beam-column structure is very stable for building houses, but it takes up space and consumes materials.

79. If your extension power cord at home is short-circuited, which device will most likely respond for safety？
(A)Voltage panel
(B)Protection gauge
(C)Circuit breaker
(D)Electrical insulation

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