【单选题】已知等差数列{a n }的公差为2,若 , , 成等比数列,则 等于( )
【简答题】已知等差数列 的公差为2,若 成等比数列, 则 =' ( ' ) A –4 B –6 C –8 D –10
【单选题】In your first days at the school you' 11 be given a test to help the teacher to ______you to a class at your level.
【单选题】已知等差数列 的公差为2,若 成等比数列,则a 2 =( )
【单选题】已知等差数列 中, =2, =8,则数列的第10项为( )
【简答题】氨基酸在等电点时主要以__离子形式存在,在pH大于pI的溶液中,大部分以__离子的形式存在,在pH小于pI的溶液中,大部分以__离子的形式存在。
【单选题】In your days at school you’ll be given a test to help the teacher to ____ you to a class at your level.
【单选题】已知等差数列 的公差为 ,且 ,若 ,则 为
【单选题】In your days at school you’ll be given a test to help the teacher to ____ you to a class at your level.