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【简答题】
已知函数f(x)在x=x 0 处连续，且 (A为常数)，问f'(x 0 )是否存在？
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举一反三
【单选题】While you are hurrying to the airport, _____ in a heavy traffic jam in a taxi is quite an unpleasant experience. [ ]
A.
having caught
B.
being caught
C.
caught
D.
having been caught
【多选题】锉削时锉刀的握法是( )。
A.
右手紧握锉刀柄，柄端抵住在姆指根部的手掌上
B.
右手大姆指放在锉刀柄上部，其余手指由下而上地握着锉刀柄
C.
左手的基本握法是将姆指的根部肌肉压在锉刀的头上，其余四指弯向手心
D.
用左手中指.无名指捏住锉刀前端
E.
右手推动并决定推动方向，左手协同右手使锉刀保持平衡
【简答题】请观看上面一段视频,分析锉削的姿势是否正确。可从锉刀握法,姿势动作,锉削时两手的用力和锉削速度以及锉削时的文明生产和安全生产知识来分析。
【单选题】Yesterday he was( ) a heavy traffic jam.
A.
caught up in
B.
catch up in
C.
reserved for
D.
shielded from
【单选题】________in a heavy traffic jam in a taxi while you are hurrying to the airport is quite an unpleasant experience．
A.
Having caught
B.
Being caught
C.
Caught
D.
Having being caught
【单选题】________ in a heavy traffic jam in a taxi while you are hurrying to the airport is quite a unpleasant experience.
A.
Having caught
B.
Being caught
C.
Caught
D.
Having been caught
【单选题】_______a heavy traffic jam on the highway, the taxi driver had to take a different route
A.
Having
B.
It had
C.
There was
D.
There being
【单选题】我国古代“以农立国”，而农业生产和自然天象联系密切，所以古人非常注重“观象授时”，积累了丰富的天文历法知识。以下关于我国古代天文历法知识，说法错误的一项是( )。
A.
金星古称“明星”“太白”“启明”“长庚”；木星古称“岁星”“岁”
B.
杜甫诗中的“人生不相见，动如参与商”中的“参”是指西方的参宿，“商”指东方的心宿，“参”“商”二星同属二十八星宿之一
C.
古代用于纪年的方法有很多，其中最常见的是干支纪年法和年号纪年法。其中干支纪年法是指以十天干和十二地支两两相配以纪年，历经六十年一循环
D.
天干只能与地支相配，而且是天干的单数与地支的双数相配，天于的双数与地支的单数相配
【单选题】________ in a heavy traffic jam is quite an unpleasant experience. [ ]
A.
Caught
B.
Having caught
C.
Being caught
D.
To catch
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