题目内容
设计IIR滤波器时，常用到的三种模拟滤波器原型是（ ）滤波器、（ ）滤波器、和（ ）滤波器。
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常见的三种模拟滤波器中，在通带和阻带内具有等波纹变化的是切比雪夫滤波器。
输入大量库血应防止发生:
输血引起溶血反应的主要表现是
P175Task 2 The words in bold are from Listening Skills &Strategies in this part. Listen to their explanations. Then complete each sentence with the correct word. You may change the form when necessary.B Intelligence refers to the ability to learn, understand, and think about things.C Transmit means to send out messages, etc. using radio, television, or other similar equipment.D. Aliens are relating to creatures from another planet.E. Deluge means a large amount of something such as letters or questions that someone gets at the same time.F. Antenna is a wire rod, etc. used for receiving radio and television signals.1. In 1969, the first pictures of Mars were to the Earth by the spacecraft Marine 6.2. Villagers look like they will be losing their main bus service in just over a fortnight, despite a(n) of complaints to the bus company.3. Astronomers call the thousands of tons of particles that fall to the Earth annually cosmic dust.4. Wireless call can be received by a number of different miles away from the caller5. John could be energetic and and he had a number of impressive successes, but he was incapable of either sustaining or capitalizing on these.6. The thought of the first contact with a(n) race only through their aircraft is one that is close to the heart of science fiction.[音频]
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