【多选题】【消耗次数：1】
若曲线上所有的点都在同一平面内，称为平面曲线。以下选项中，属于平面曲线的有()。
①
椭圆
②
双曲线
③
抛物线
④
螺旋线
⑤
顶点重合的两圆锥面交线
参考答案：
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相关题目
【多选题】
若曲线上至少存在不在同一平面内的四个点，称为空间曲线。以下选项中，属于空间曲线的有()
①
抛物线
②
双曲线
③
螺旋线
④
两球面的交线
⑤
轴线不相交、不平行的两圆柱面交线
【简答题】
证明：平面曲线的挠率为零
随机题目
【单选题】
26.I was really anxious about you.You ___home without a word.
①
mustn`tleave
②
couldn`thaveleft
③
needn`tleave
④
shouldn`thaveleft
【单选题】
21.—I went to visit Xi`an City Wall yesterday afternoon. ---Oh, did you ? _______.
①
SodidI
②
SoIdid
③
NeitherdidI
④
NordidI
【单选题】
25.She ____the loud speaker so that everyone in the lecture room could hear her.
①
turnedon
②
turnedup
③
turnedoff
④
turneddown
【单选题】
22._____in a friendly way, their quarrel came to end.
①
Beingsettled
②
Settled
③
Havingsettled
④
Settling
【单选题】
30. —Shall I return the book to the library ? ----_______Let Li Ping do it.
①
Allright
②
Yes，please
③
Notrouble
④
No，thanks
【单选题】
28.---Jane won the first prize in the concert. ---______.
①
Soshedid
②
Sodidshe
③
Soshedid，too
④
Sodidshe，too
【单选题】
23.____time we had at the dinner party !
①
Howwonderful
②
Whatawonderfultime
③
Howawonderfultime
④
Whatwonderfultime
【单选题】
27.---I`ll be away for a visit to the History Museum.Would you mind going with me ? ---______.
①
I`lllikeit
②
No，I`venotime
③
Notatall，I`dbegladto
④
Yes，ofcourse