保险人与投保人之间直接签订保险合同而建立保险关系的保险叫做( )。
A．再保险 B．重复保险 C．共同保险 D．原保险
参考答案：D
Near the table ______ a hungry dog, which desired to satisfy his hunger with ______ fell from the table.
A．lay; what
B．lay; that
C．laid; that
D．laid; something
A．时刻t线圈中电流的瞬时值icosωt
B．线圈中电流的有效值I
C．线圈中电流的有效值I=
D．线圈消耗的电功率P
cosωt
