磁头记录缝隙g,磁带运行速度v,记录上限频率f的关系是什么如果记录磁头缝隙是1μm,

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问题:

磁头记录缝隙g,磁带运行速度v,记录上限频率f的关系是什么如果记录磁头缝隙是1μm,其记录磁带运行速度为48mm/s,问其记录的上限频率fmax是多少?

考点:音响调音员高级音响调音员高级
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关于氨气(NH3)的说法不正确的是[ ]

A.保持氨气化学性质的最小粒子是氨分子

B.每个氨分子是由1个氮原子和3个氢原子构成的

C.液态氨中氨分子是在不断运动着的

D.同温同压下氨气的密度大于空气的密度

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He is ______to win the political campaign and becomes the president.

A.possible

B.likely

C.probable

D.perhaps

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There was once a professor of medicine, who was very strict with the students. Whenever he took the chair on the exam committee(担任考试委员会 * * ), the students would be in fear, because he was seldom pleased with the answers they gave. A student would be lucky enough if he or she could receive a good mark from him. At the end of the term, the students of medicine would take their exam again. Now a student entered the exam room and got seated before the committee. This student was a little nervous as he knew it would not be so easy to get through the exam at all.

The professor began to ask. The student was required to describe a certain illness, his description of which turned out to be OK.

  Then the professor asked about the cure (药剂) for illness, and the student, too, answered just as right.

“Good,” said the professor, “and how much will you give the patient?”

“A full spoon”, answered the student.

“Now you may go out and wait for what you can get.”, said the professor. At the same time, the committee discussed carefully the answers the student had given. Suddenly the student noticed that there was something wrong with his last answer. “ A full spoon is too much,” he thought to himself. Anxiously he opened the door of the room and cried, “Mr. Professor, I’ve made a mistake! A full spoon is too much for a patient. He can take only five drops.”

“I’m sorry, sir.” said the professor coldly, “But it’s too late. Your patient has died.”

小题1:The students were afraid of the professor because_________.

A.they often angered and disappointed him

B.their answers often astonished him

C.their answers seldom satisfied him

D.he often misunderstood them and gave them bad marks小题2: The student’s description of the illness was           .

A.not correct

B.not satisfied

C.completely discouraging

D.accepted.小题3:Before he left the room the student was almost sure that          .

A.he had passed the exam, and the only thing was to wait for the mark

B.his last answer was satisfying

C.he had made a mistake

D.he had not done well in the exam.小题4:Which of the following is Not true?

A.The patient will be in danger if he’s taken as much as a full spoon.

B.The doctor will be in trouble if he’s given the patient a full spoon.

C.Since one spoon is less than five drops, the patient will be all right soon if he takes only one full spoon at a time.

D.If the patient wants to remain safe, he should take no more than five drops at a time.

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其他活、鲜、冷的濒危软体动物

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女性32岁,垂直低位阻生拟拔除,经翼下颌传导麻醉后患者随后出现头晕,胸闷,心悸,面色苍白,四肢湿冷无力,脉搏快而弱。

上述症状是()。

A.肾上腺素反应

B.晕厥

C.癔病

D.药物中毒

E.过敏反应

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