用不等式表示:8与x的3倍的和是正数( )。
>0
全国银行间债券回购合同在办理回购登记后生效。合同一经成立,交易双方立全面履行合同规定的义务,不得擅自变更或解除合同。()
The Internet is so closely connected with our daily life. Can you _____ a life without it? [ ]
A. understand
B. imagine
C. consider
D. expect