如图所示,四个灯泡的电阻分别是R1=R3=10欧,R2=R4=30欧,分别用P1

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问题:

如图所示,四个灯泡的电阻分别是R1=R3=10欧,R2=R4=30欧,分别用P1、P2、P3、P4表示这四个灯泡的电功率,那么(  )

A.P1>P2>P3>P4

B.P1>P3>P2>P4

C.P4>P3>P2>P1

D.P2>P1>P3>P4

考点:电功电功率
题型:选择题

女性实验员,昏迷送急诊。突出症状为身体极其高热。疑误食入实验室毒物,最可能的是

A.鱼藤酮

B.氰化物

C.二硝基酚

D.二巯基丙醇

E.异戊巴比妥

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在激烈的市场竞争中,有些企业取得成功,有些企业则面临倒闭与破产。围绕当前食品安全问题,对食品生产企业的良性发展与成功经营,你有哪些合理化建议?(10分)

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接触式IC卡的电子现金交易在以下哪个步骤中完成真正的扣款动作?()

A.应用初始化

B.卡片行为分析

C.卡片风险管理

D.读最后一条记录数据后

题型:选择题

B Egyptian Villages 埃及村落

Most of the inhabitants live in mud-brick homes, their (1)  walls insulating against the afternoon heat. Flat roofs, exposed (2)  the northern evening breezes, serve as cool sleeping (3)  as well as storage areas. Villagers plaster the outer walls (4)  often trim them in blue, a color they believe (5)  off the evil eye. As a man becomes richer, (6)  can add a second story to his house perhaps (7)  his married son. Those villagers who have made the (8)  to Mecca paint the legend of their trip on (9)  outer walls of their homes. Such hajj houses, along (10)  the mosques, are the most distinguished buildings in a (11)

Some villagers build ornate pigeon coops close to their (12) , using the birds as food and their droppings to (13)  crops. Many houses still have dirt floors and lack (14)  or running water; women with jars balanced on their (15)  make the trek to the community well, and children donkeys haul the (16)  liquid in jerry cans.

All (17)  said, government sponsored building programs have also brought newer (18)  residences and utilities to some villages, particularly those outside (19)  Nile Valley in the Oases and the Red Sea (20)  areas.

18.()

题型:选择题

下列关于外汇风险头寸的说法正确的是()。

A.外汇风险头寸是承担外汇风险的外币资金

B.外汇风险头寸是企业或个人持有的外币资产或负债

C.外汇风险头寸是企业外币资产与外币负债不相匹配的部分

D.在外汇买卖中,风险头寸表现为外汇持有额中“超买”或者“超卖”的部分

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