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【简答题】
设 , ,求 (1) 在 处增加最快的方向以及 沿这个方向的方向导数; (2) 在 处减少最快的方向以及 沿这个方向的方向导数; (3) 在 处的变化率为零的方向.
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反馈参考答案：
举一反三
【单选题】In the film we saw last night, the hero _______ his wife to death with his sword.
A.
throat
B.
thrust
C.
trust
D.
thread
【简答题】属于阴证范围的是:( )
【单选题】— The film we saw yesterday was quite________, wasn't it? — Yes, and we were really________when seeing it. [ ]
A.
disappointing；bored
B.
disappointed；bored
C.
disappointed；boring
D.
disappointing；boring
【单选题】The film we saw last night is called The Bridges of Madison County, which is ____ a novel by Robert James. [ ]
A.
based on
B.
basing on
C.
based at
D.
basing at
【单选题】Yesterday we saw a ______ film about the Independence War.
A.
historied
B.
historical
C.
historian
D.
historic
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