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【简答题】
He flewto New York last year. 请翻译上述句子。
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皮皮学刷刷变学霸
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【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
【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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