30.下列何者不是抗磨軸承的優點?(A)低磨擦 (B)所需潤滑油較少 (C)高靜力強度 (D)可承受徑向和軸向複合載荷

48. One aircraft that certificated as transport category by CAA or by civil aviation authority of the State of Design and prohibited for acrobatic operation is categorized as: (A)Commuter Category Aircraft (B)Transport Category Aircraft (C)Normal Category Aircraft (D)Utility Category Aircraft