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【单选题】
一曲线在其上任意一点 处的切线斜率等于 ,这曲线是( )A.
直线
B.
抛物线
C.
圆
D.
椭圆
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反馈参考答案：
举一反三
【单选题】There is a direct flight at 20:00 in the afternoon or a flight at 9:30 in the morning that______ in Chicago.
A.
stops by
B.
stops over
C.
pulls up
D.
drops in
【单选题】Is the flight a direct flight?
A.
Yes
B.
No, it has a stopover.
C.
It is not mentioned.
【单选题】From larger stations that are not served by direct freight flight, the freight may be carried by ( ) that connect with a freight flight
A.
charter flight
B.
airport facility
C.
passenger flight
D.
any flight
【单选题】Why does the woman have to change her flight in Madrid?
A.
There's no direct flight.
B.
There's no seat available on direct flight.
C.
She wants to leave tomorrow morning.
D.
She will contact some people at Madrid.
【单选题】The key word in Paragraph 4 is ______.
A.
disability
B.
ignorance
C.
prejudice
D.
barriers
【简答题】按照车门开启及结构形式主要分为( )和( )。
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