已知向量a=(1,n),b=(-1,n),若2a-b与b垂直,则|a|=( )。
2
Read and judge. 根据短文内容,判断下列句子是(T)否(F)正确。
It's 2:30 in the aftemoon. Look! We're having our P.E.class on our play-ground. Peter, John, Sam, Mark
and I are playing basketball. Mary and Judy are skipping with their skipping rope. Mr. Paul is playing games
with some boys and girls. Sue and May like to read books. They are reading under a big green tree. We're all
happy. Because we like our P. E. class. We like the school work.
( ) 1. It's 2:30 in the afternoon. We're at school.
( ) 2. We're having an English class.
( ) 3. Mr. Paul is our P. E. teacher.
( ) 4. Mary and Judy are playing with their skipping rope.
( ) 5. We don't like our school work.
撤销挂失应使用[7119客户凭证挂失/解挂]交易办理,打印()
A、综合签约业务回执
B、个人特殊业务申请书
C、内部通用凭证