单项式2xy,6x2y2,-3xy,-4x2y2的和为( )。
-xy+2x2y2
You have also made some readjustment( )your import and export business,have you
A.for
B.under
C.with
D.in
在室内小区中,信令表现是Radio Link Restore能够上来,但是RRC connection complete没有接收到,可能原因是()
A.驻波比告警
B.干放时隙转换点错误
C.E1自环
D.基站故障