已知数列an的前n项和为Sn,且a1=-10,an+1=an+3n∈N*,则Sn取最小值时,n的值是( )
音调跟发声体振动的____有关; 响度跟发声体的____有关; 有时形容某一个歌唱家的声音很高,实质是说歌唱家声音的____.
一Pauline has lost her phone.
一No.It's in her bag.I hear it