A:when was it that
B:that it was whe
C:where it was that
D:it was where that
下列文言句中划线词语的解释,有误的一项是( )
下列关于位移和路程的说法,正确的是( )
设正项等比数列an,lgan成等差数列,公差d=lg3,且lgan的前三项和为6lg3,则an的通项为( )