单项选择题

以下哪项是从经济角度对保险下定义?()

A、保险是一方同意补偿另一方损失的契约
B、保险是对不可预计的损失进行重新分配的融资活动
C、保险是有效转移风险、保障社会稳定的一种手段
D、无风险，无保险

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According to the passage, the New Urbanists cite which one of the following as a harmful result of the need for people to travel extensively every day by automobile?
A．It imposes an extra financial burden on the residents of sprawling suburbs.
B．It increases the amount of time people spend in situations in which antisocial behavior. occurs.
C．It produces significant amounts of air pollution and thus tends to harm the quality of people's lives.
D．It decreases the amount of time that parents spend in enjoyable interactions with their children.

A.It
B.
B．It
C.
C．It
D.
D．It
E.

单项选择题

正弦交流电频率为50Hz时，角频率为()。

A.314
B.100
C.50