— It's time to switch off the rice cooker, Polly.
— OK. Three minutes later, we will have our dinner.
A:Turn up
B:Turn down
C:Turn off
数列an中,an=2n-106,则使前n项和Sn取得最小值的n的值为 ( )
一个数的16倍是43.2,这个数的30倍是____
下列函数中,以π2为最小正周期的偶函数是( )
家鸽的双重呼吸是指( )