先化简,再求值:[(a-2b)2+(a+4b)(3a-b)]÷(2a),其中a是

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问题:

先化简,再求值:[(a-2b)2+(a+4b)(3a-b)]÷(2a),其中a是27的立方根,b是4的算术平方根.

考点:整式的加减乘除混合运算
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下列“阑尾炎”诊断要点,错误的是()

A.阑尾内多发充盈缺损

B.边缘毛糙

C.排空加快

D.定点压痛

E.管腔狭窄、管壁僵直

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Taiwan police cannot decide whether to treat it as an extremely eleven act of stealing or an even cleverer cheat . Either way , it could be the perfect crime (犯罪), because the criminals are birds—horning pigeons !

The crime begins with a telephone message to the owner of a stolen car : if you want the car back, pay up then, the car owner is directed to a park, told where to find a bird cage and how to attach money to the neck of the pigeon inside . Carrying the money in a tiny bag , the pigeon flies off .

There have been at least four such pigeon pick-ups in Changwa. What at first seemed like the work of a clever stay-at-home car thief, however , may in face be the work of an even lazier and more inventive criminal mind—one that avoid (避免)not only colleting money but going out to steal the car in the first place . Police officer Chen says that the criminal probably has pulled a double trick: he gets money for things he cannot possibly return . Instead of stealing cars , he lets someone else do it and then waits for the car-owner to place an ad (启事) in the newspaper asking for help .

The theory is supported by the fact that , so far , none of the stolen cars have been returned . Also, the amount of money demanded-under 3,000 Taiwanese dollars –seems too little for a car worth many times more .

Demands for pigeon-delivered money stopped as soon as the press reported the story. And even if they start again, Chen holds little hope of catching the criminal . “We have more important things to do, ” he said .

1.After the car owner received a phone call. He          

A.went to a certain pigeon and put some money in the bag it carried

B.gave the money to the thief and had his car back in a park

C.sent some money to the thief by mail

D.told the press about it

2.The “lazier and more inventive” criminal refers to          .

A.the car thief who stays at home     

B.one of those who put the ads in the paper

C.one of the policemen in Changwa  

D.the owner of the pigeons

3.The writer mentions the fact that “none of the stolen cars have been returned” to show       .

A.how easily people get fooled by criminals

B.what Chen thinks might be correct

C.the thief is extremely clever

D.the money paid is too little

4.The underlined word “they” in the last paragraph refers to          .

A.criminals            B.pigeons

C.the stolen cars    D.demands for money

5.We may infer from the text that the criminal knows how to reach the car owners because     .

A.he reads the ads in the newspaper  

B.he lives in the same neighborhood

C.he has seen the car owners in the park 

D.he has trained the pigeons to follow them

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适宜的太阳辐射可使:()

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根据舒伯的的职业指导策略,对于那些职业选择不确定者,应该()。

A.协助当事人了解影响其职业选择的个人因素和社会因素

B.协助当事人收集和评估有关个人和职业的资料,作为决策的依据

C.协助当事人认识与职业发展有关的个人和社会因素,并参照职业发展任务的重点,逐步发展当事人的职业自我

D.注意分析影响当事人情绪以及无法确定的各种文化、社会、生理因素,帮助其消除疑虑和障碍

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紧固设备的螺栓主要采用的螺纹形式是矩形螺纹。()

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