【单选题】如果f(a+b)=f(a)f(b)且f(1)=2,则 + + = [ ]
【单选题】如果f'(x)存在,则(∫df(x))'=( ).
【单选题】根据《建筑边坡工程技术规范》中对边坡高度的规定,对岩质边坡超出( )m,土质边坡超出15m的边皮必须进行专门的认证和特殊的设计。
【单选题】If I were in ______ position of the headmaster, I would make every effort to bring ______ end to cheating in exams.