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如图，电源电压保持不变，电阻R1＝R2＝R3＝10Ω。若闭合S1、S2、S3，则R1、R2的连接方式为   

                       ，此时电流表的示数为I1；若S1闭合，S2、S3断开，此时电流表的示数为I2；则I1：I2＝

_____              。

答案

并联，4:1

单项选择题

在教育教学中，贯彻“回归生活世界”的理念，这是指( )。

A．教育学的理论性与实践性关系问题 B．教育学的本土化与国际化关系问题
C．教育学的科学性与价值性关系问题 D．教育学的专门化与综合化关系问题
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Insurance is the sharing of (1) . Nearly everyone is exposed (2) risk of some sort. The house owner, for example, knows that his (3) can be damaged by fire; the ship owner knows that his vessel may be lost at sea; the breadwinner knows that he may die by (4) and (5) his family in poverty. On the other hand, not every house is damaged by fire or every vessel lost at sea. If these persons each put a (6) stun of money into a pool, there will be enough to (7) the needs of the few who do suffer (8) . In other words the losses of the few are met from the contributions of the (9) . This is the basis of (10) . Those who pay the contributions are known as (11) and those who administer the pool of the contributions as insurer.
The (12) for an insurance naturally depends on how the risk is to happen as suggested (13) past experience. If the companies fix their premiums too (14) , there will be more competition in their branch of insurance and they may lose (15) . On the other hand, if they make the premiums too low, they will not have (16) and may even have to drop out (17) business. So the ordinary forces of supply and (18) keep premiums at a proper (19) to both insurers and those who (20) insurance.
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