下列哪项不是流行性腮腺炎的并发症（）
A.睾丸炎
B.卵巢炎
C.胰腺炎
D.心肌炎
E.脑膜炎
参考答案：D
A．线速度随纬度增大而减小
B．角速度随纬度增大而减小
C．向心加速度随纬度增大而增大
D．自转周期等于一昼夜即24小时
Andrew wants to buy Ben’s fixed-wing propeller aeroplane. He is not sure whether the contract should be in writing. He is also not sure what the consequences would be if they decide to enter into a written contract.Required:Advise Andrew on the validity of an oral or written contract. (10 marks)
