第9题: [单项选择]New service from the telephone company is delivered over fiber, but the technician does not have a fiber module for the router. Which of the following would remedy this issue?() A. OTDR B. Media converter C. CSU/DSU D. Fiber repeater 参考答案:B
第22题: [单项选择]岩石的抗压强度与混凝土强度等级之比,对于大于或等于C30的混凝土,不应小于 ( )。 A. 1.5 B. 1.8 C. 2.0 D. 2.2 参考答案:C 答案解析:[解析] 混凝土强度等级为C60及以上时,应进行岩石抗压强度检验,其他情况下,如有必要时也可进行岩石的抗压强度检验。岩石的抗压强度与混凝土强度等级之比,对于大于或等于C30的混凝土,不应小于2.0,其