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【单选题】
下列化合物中同时含有伯、、叔氢的是( )。A.
2,2,4,4-四甲基
B.
2,3,4-三甲基
C.
2,2,4-三甲基
D.
正烷
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【简答题】我们有如下代码:import numpy as np; x = np.array([[77, 93, 23],[54, 58, 12],[69, 25, 23],[65, 55, 56]]);rows = np.array([[0,0],[3,3]]); cols = np.array([[0,2],[0,2]]); y = x[rows,cols];print (y) 运行后y的内容是什么?...
【单选题】若 有条件表达式 (exp) ? x++ : y− − ,则以下表达式中能完全等价于( exp )的是( )。
A.
(exp==0)
B.
(exp!=1)
C.
(exp==1)
D.
(exp!=0)
【简答题】我们有如下代码:import numpy as np; x = np.array([[54, 21, 43],[7, 21, 17],[53, 47, 32],[37, 8, 99]]);rows = np.array([[0,0],[3,3]]); cols = np.array([[0,2],[0,2]]); y = x[rows,cols];print (y) 运行后y的内容是什么?仅输...
【单选题】一般来说,要求声音的质量越高,则()
A.
量化级数越低，采样频率越低
B.
量化级数越高，采样频率越高
C.
量化级数越低，采样频率越高
D.
量化级数越高，采样频率越低
【单选题】About _________ of the teachers in tour school were born in ________.
A.
two thirds, 1970
B.
two thirds, the 1970s
C.
two third, 1970s
D.
two third, the1970
【单选题】of the teachers in our school women.
A.
Two thirds, are
B.
Two threes , is
C.
Two third, are
D.
Two thirds , is
【单选题】______ of the room ______ empty．
A.
Two third; are
B.
Two thirds; is
C.
Two third; is
D.
Two thirds; are
【单选题】______ of the coats ________ made of cotton. They feel comfortable.
A.
Two-thirds; is
B.
Two-thirds; are
C.
Two-third; is
D.
Two-third; are
【简答题】我们有如下代码:import numpy as np; x = np.array([[4, 99, 23],[41, 47, 43],[56, 32, 49],[4, 36, 79]]);rows = np.array([[0,0],[3,3]]); cols = np.array([[0,2],[0,2]]); y = x[rows,cols];print (y) 运行后y的内容是什么?仅输...
【简答题】我们有如下代码:import numpy as np; x = np.array([[79, 32, 73],[30, 96, 58],[22, 13, 37],[3, 31, 20]]);rows = np.array([[0,0],[3,3]]); cols = np.array([[0,2],[0,2]]); y = x[rows,cols];print (y) 运行后y的内容是什么?仅...
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