在电压不变的电源上接一个4Ω的电阻时,电流是3A;当再串联上一个电阻R时,电流为1A。那么,电阻R的阻值是
A. 12Ω
B. 3Ω
C. 8Ω
D. 4Ω
答案:C
单词填空,注意使用其正确形式(共10题,每题1分,满分10)
小题1:He was badly __________ (受伤的)in the earthquake.
小题2:Her dream was to_____________ (骑车)down the entire river.
小题3:She looks young, but she’s __________ (实际上) 50.
小题4:She kept a travel ___________ (日记)during her trip to China two hundred years ago, so we can learn a little about the history of the city from it.
小题5:The army __________ (组织)teams to help the homeless people in the flood.
小题6:The teacher _________ (要求) all the students should finish the exercises before the class was over.
小题7:Most of the old part of the city was _____________ (破坏) by bombs during the war.
小题8:They began the ____________(救援) work right away as soon as the earthquake happened.
小题9:He used to be a confident __________ (法官).
小题10:The goods will be _____________ (运输)to Singapore by air.
2011年3月,鉴于利比亚国内安全形势发生重大变化,中国政府迅即采取有效措施,全力保障在利人员生命财产安全,通过海、陆、空多种途径紧急撤离中方在利比亚人员,其行动之迅速、规模之大、效率之高,赢得了国际社会的广泛赞誉。这体现了[ ]
①我国履行主权国家的国际义务
②我国是维护世界和平稳定的主要力量
③我国行使主权国家的基本权利
④我国政府在外交领域贯彻以人为本理念
A、①②
B、②③
C、②④
D、③④