【单选题】空燃比氧传感器的工作温度比氧传感器( )。
【单选题】化简: 2sin2α 1+cos2α ? cos 2 α cos2α =( )
【单选题】化简式子 2+2cos1 -sin 2 1 + 2-2sin1 -cos 2 1 + 1-2sin1cos1 的结果为( )
【单选题】The pictures always remind me of those unforgettable memories _______ we had a lot of fun together in our childhood. [ ]
【单选题】化简cos(α+β)?cosβ+sin(α+β)?sinβ为( )
【简答题】The pictures always ___ me of our holiday in England.
【单选题】化简: 2+cos4- sin 2 2 得( )