【简答题】已知函数 , ,其中 . (1)设函数 ,若 在区间 是单调函数,求 的取值范围; (2)设函数 ,是否存在 ,对任意给定的非零实数 ,存在惟一的非零实数 ( ),使得 成立?若存在,求 的值;若不存在,请说明理由.
【简答题】用复合词表示下列各意思。(例:someone who writes songs: songwriter) a mine that produces gold:
【简答题】设函数 。 (1)求 的单调区间; (2)是否存在正实数 ,使函数 的定义域为 时值域为 ? 若存在,求 的值,若不存在,请说明理由。
【单选题】In the sentence "What if the buyer’s buyer is unable to pay before the buyer must pay the seller" , the word " buyer" appears three times. So, the identity of the third "buyer" is ( ).
A.
the exporter who produces the goods by himself
B.
the importer who buys the goods to use by himself
C.
the broker who buys goods from someone with a price and then sell it to others with a much higher price
【单选题】Dale Dougherty defines a maker as someone who builds, creates or ______ physical materials, whether food, clothing or gadgets.
【简答题】someone who produces music