根据语境，选择恰当的单词填写在横线上。
（1）The planes are at the______________.
（2）We are going to ___________ the Ming Tombs.
（3）These ducks are very _____________.
（4）Let’s _______ the ducks.
（5）I can have these ___________.
根据语境，选择恰当的单词填写在横线上。
（1）The planes are at the______________.
（2）We are going to ___________ the Ming Tombs.
（3）These ducks are very _____________.
（4）Let’s _______ the ducks.
（5）I can have these ___________.
,则
的最大值为________．
在以坐标原点为圆心的圆上，则该圆在点P处的切线方程为________．
_________．
在点
处的切线与曲线
相切，则a= ．
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