I English and Kate to the park last Mon

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问题选择题

I English and Kate to the park last Monday.

A. studies; goes
B. studied; go
C. studied; went
D. studies; went

答案

答案：C

解答题

设f（x）=ln²x-1，g（x）=x²-2x

（1）求f（x）的单调区间与极值；

（2）当x＞1时，比较f（x）与g（x）的大小．

填空题

堆焊两相邻焊道之间凹下量不得大于（）mm。