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【简答题】
请阐述石油定义? 2.石油中烃类包括哪些物质? 3.常温常压下烃类的状态?
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【简答题】设幂级数f(x)=a 0 +a 1 x+…+a n x n +…于x=1处为收敛．又设0＜α＜1．则下列幂级数 必于h=1-α处为收敛，其和为f(1)．[哈兑-列脱胡特]
【单选题】In spring, days are getting ________
A.
longer and longer
B.
the longer
C.
the longest
D.
the longer, the longer
【单选题】Questions 22 to 25 are based on the passage you have just heard.
A.
It is a bit difficult to learn.
B.
It was popular in New Zwaland.
C.
It is a traditional type of ballet.
D.
It evolved in the mid-1970s.
【单选题】Questions 22 to 25 are based on the passage you have just heard.
A.
They have to look for food and shelter underground.
B.
They take little notice of the changes in temperature.
C.
They resort to different means to survive the bitter cold.
D.
They have difficulty adapting to the changed environment
【单选题】Questions 22 to 25 are based on the passage you have just heard.
A.
His students had trouble getting on with each other.
B.
A lot of kids stayed at school to do their homework.
C.
His students were struggling to follow his lessons.
D.
A group of kids were playing chess after school.
【简答题】在酸碱中和反应中,使用一种已知物质的量浓度的酸或碱溶液跟未知浓度的碱或酸溶液_______,测出二者的体积,根据化学方程式中酸和碱的_______的比值,就可以计算出碱或酸的溶液的浓度。
【单选题】设有数列 ,下列断语中 ( ) (1) 若 ,且 ,则数列 收敛; (2) 若 ,且 ,又数列 收敛, 则数列 都收敛。
A.
(1) 正确而 (2) 不正确；
B.
(1) 不正确而 (2) 正确；
C.
(1) (2) 都不正确；
D.
(1) (2) 都正确；
【简答题】圆形等截面梁的直径 d=30mm ,危险截面的正应力 σ max =100Mpa ,则危险截面的弯矩 M max = N.m. 。
【单选题】Questions 22 to 25 are based on the passage you heard.
A.
They need decorations to show their status.
B.
They prefer unique objects of high quality.
C.
They decorate their homes themselves.
D.
They care more about environment.
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