函数y=sinxsinπ2+x的最小正周期是( )
如图所示,电源电压不变,灯L标有“6V 6W”字样.当闭合开关S1时,灯L正常发光,它的电阻是____ Ω;再闭合开关S2,前后两次电流表的示数之比为2:3,则电阻R的阻值为____ Ω.
已知a是函数f(x)=lnx-(12)x的零点,若0<x0<a,则fx0的值满足( )
—The children in rural areas have few books to read. Let's ______ some books to them.—Great, it is a good idea.