“邮证通”业务是邮政储蓄系统和()系统进行联网,推出的更高层次的邮证合作产品。
A.保险公司
B.基金公司
C.证券公司
D.投资公司
参考答案:C
Hurry up! The train _____________. You know it _______ at 8:30.
A.leaves; leaves
B.is leaving; leaves
C.leaves; is leaving
D.is leaving; is leaving
ΔU=0,则负载为()
A、电感
B、电阻
C、电容