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【单选题】
下面属于合法C语言标识符的是:A.
3xy
B.
XY.2
C.
a_3
D.
?xyz
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反馈参考答案：
举一反三
【简答题】求下列三个二次曲面的公共径面． x 2 +y 2 +z 2 -2x+4y-11=0， 3y 2 +4xy-2xz+6z+5=0， 6x 2 -3y 2 +2z 2 +4xy-8xz-4x+4y-5=0.
【单选题】As a result of Williams' work ______.
A.
he did not get enough sleep
B.
there was an oily smell from his clothes
C.
the dog grew accustomed to travelling by train
D.
the dog was confused about the time of the day
【单选题】_________ sweet, the flowers in the botanic garden attract the visitor.
A.
Smelt
B.
To smell
C.
To be smelt
D.
Smelling
【简答题】分离极性较强的物质,______。
【单选题】An elephant uses its tusks for______.
A.
digging and lifting things
B.
washing
C.
drinking
D.
smelling
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