题目内容

Whenever the professor explained something, she kept smiling and nodding her head from time to time ______ understanding every word of his lecture.

A. as if
B. like
C. just like
D. as though she

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Instead of ______ for help, we decided to work it out by ourselves.

A. to ask
B. ask
C. asking
D. asked

is, are Most of the houses in this town ______ new.

设某厂某产品的需求函数为Q=116-2P，其中P(万元)为每吨产品的销售价格，Q(吨)为需求量．若生产该产品的固定成本为100(万元)，且每多生产1吨产品，成本增加2(万元)．在产销平衡的情况下：试问如何定价，才能使工厂获得的利润最大最大利润是多少

利用微分计算arctan1.01的近似值．