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【简答题】
求u=x 2 +2y 2 +3z 2 +2xy-4x+2y-4z在点O(0，0，0)，A(1，1，1)，B(-1，-1，-1)处的梯度，并求梯度为零之点．
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举一反三
【单选题】In recent years,TCP/1P has also begun to be used by telephone companies to provide faster, cheaper telephone(74)
A.
transmitting
B.
transmited
C.
transfers
D.
transmissions
【简答题】I first consider (telephone) ______ him, but then I decided to go and to speak to him in person.
【简答题】在等差数列 中 求此数列的通项公式
【单选题】The telephone rang.The father asked ,"who will______the telephone"
A.
call
B.
pick
C.
answer
D.
hold
【单选题】'The same meaning is attached to telephone calls made after 11:00 p. m. ' Here 'attached' means______.
A.
taken
B.
drawn
C.
given
D.
shown
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