【单选题】设函数f(x,y)=x 2 y 3 ,当x=1,y=-1,Δx=0.01,Δy=-0.01时,f(x,y)的全微分为( ).
【简答题】选出下列单词的反义词。 ( ) 1. big ( ) 2. heavy ( ) 3. tall ( ) 4. black ( ) 5. strong ( ) 6. short ( ) 7. boy A. white B. short C. girl D. small E. long F. thin G. light
【单选题】选择正确的回答。 It’s a good day, why not go out and have a picnic.
【简答题】根据句意,用画线部分的反义词完成句子。 1. The blue bag is too heavy . The yellow one is _____. 2. It's hard to make a card, but it's _____ with a computer. 3. The two boys are in the same class, but they have _____ hobb...
【单选题】函数z=x 2 y 2 ,当x=1,y=1,Δx=0.2,Δy=-0.1时的全微分为( )
【判断题】协作学习中建立的协作小组,小组成员间的能力最好相同,以便进度一致
【简答题】听音,选出你所听单词的反义词,读两遍。 ( ) 1. A. heavy ( ) 2. A. old ( ) 3. A. east ( ) 4. A. child ( ) 5. A. young ( ) 6. A. bigger B. longer B. fatter B. north B. light B. happy B. shorter C. b...