核对6kV线路三相电源的相序，应用( )电工仪表。
A．相位表
B．周波表
C．高压相序表
D．低压相序表
参考答案：C
-- Is there any possibility of the film ____ in Paris International Festival?
--- Not in the least, because the audience generally think little of it.
A．trying out
B．tried out
C．to try out
D．being tried out
设
(Ⅰ)求出积分f(x)的表达式；
(Ⅱ)求f(x)在(0，+∞)的最小值点.
