My uncle knows several foreign languages_爱下问搜题

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问题选择题

My uncle knows several foreign languages , ______ English , French and Japanese .

A．for example

B．for instance

C．such as

D．that is

答案

答案：C

解答题

已知函数f(x)=

．
（Ⅰ）求f（x）的定义域；
（Ⅱ）若角α在第一象限且cosα=

，求f（α）．

判断题

炉水预热温度低可以采取提高2.0MPa蒸汽压力的措施。