A:if they were interested in dinosaur
B:when was Albert Einstein bor
C:what they will do with the computer
D:how many trees they have planted
函数fx=3sin2x+cos2x( )
18×34= ____
从我国人口普查情况看,几乎没有一个县或市的居民是单一民族,说明我国民族的分布特点是( )