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BGA uses a ceramic or plastic substrate with an area array of bumps to connect the substrate to the circuit board.
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发布时间：2022-01-07
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第1题
表面贴装集成电路的封装主要有小外形封装（SOP: Small Outline Package）、 、方形扁平封装（QFP: Qua
d Flat Package）、无引线陶瓷芯片封装（LCCC: Leadless Ceramic Chip Carrier）、球栅阵列封装（BGA：Ball Grid Array）封装、载带自动键合（TAB：tape automated bonding）、微凸点连接（MBB: Micro-Bump Bonding）等。
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第2题
表面贴装集成电路的封装主要有 、塑封有引线芯片封装（PLCC: Plastic Leaded Chip Carrier）、方形扁
平封装（QFP: Quad Flat Package）、无引线陶瓷芯片封装（LCCC: Leadless Ceramic Chip Carrier）、球栅阵列封装（BGA：Ball Grid Array）封装、载带自动键合（TAB：tape automated bonding）、微凸点连接（MBB: Micro-Bump Bonding）等。
点击查看答案
第3题
表面贴装集成电路的封装主要有小外形封装（SOP: Small Outline Package）、塑封有引线芯片封装（PLCC
: Plastic Leaded Chip Carrier）、 、无引线陶瓷芯片封装（LCCC: Leadless Ceramic Chip Carrier）、球栅阵列封装（BGA：Ball Grid Array）封装、载带自动键合（TAB：tape automated bonding）、微凸点连接（MBB: Micro-Bump Bonding）等，
点击查看答案
第4题
Answer the following questions using the informati...
Answer the following questions using the information below: Mayan Potters manufactures two sizes of ceramic paperweights, regular and jumbo. The following information applies to their expectations for the planning period: Cost Pool Overhead Costs Activity-cost driver Materials handling $ 45,000 90,000 orders Machine maintenance $300,000 15,000 maintenance hours Setups $270,000 45,000 setups Inspections $105,000 21,000 inspections Total support costs $720,000 Production Estimates Production units: Regular = 8,000,000 units Jumbo = 16,000,000 units Machine-hours = 200,000 mh Labor-hours = 400,000 dlh Mayan Potters uses an ABC system and assigns overhead costs based on the overhead activity information provided above. The inspections activity-cost driver rate is:
A、A) $0.50
B、$2.00
C、$20.00
D、$5.00
第5题
In“O, Captain! My Captain!"，Whitman uses many writing devices, excluding______.
A.synaethesia
B.metaphor
C.repetition
D.symbolism
第6题
O'Leary's program is different from other similar software in that______.A．it aids the pol
O'Leary's program is different from other similar software in that______.
A．it aids the police in solving criminal cases more quickly and easily
B．it carries out a census to get detailed information about a given city
C．it can really combines research with pleasure
D．it uses more maths
第7题
Which of the following statements about WAN store and forward is TRUE？
A、A system that uses the store and forward paradigm can keep each data link busy, and thus, decrease overall performance.
B、The forward operation occurs when a packet arrives: I/O hardware inside the packet switch places a copy of the packet in memory.
C、The store operation occurs once a packet has arrived and is waiting in memory.
D、The processor examines the packet, determines its destination, and sends the packet over the I/O interface that leads to the destination.
第8题
Part ADirections: Read the following texts and answer the questions which accompany them b
Part A
Directions: Read the following texts and answer the questions which accompany them by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1.
The Stone age, the Iron age. Entire epochs have been named for materials. So what to name the decades ahead？ The choice will be tough. Welcome to the age of superstuff. Material science--once the least sexy technology—is bursting with new, practical discoveries led by superconducting ceramics that may revolutionize electronics. But superconductors are just part of the picture: from houses and cars to cook pots and artificial teeth, the world will sometime be made of different stuff. Exotic plastics, glass and ceramics will shape the future just as surely as have genetic engineering and computer science.
The key to the new materials is researchers' increasing ability to manipulate substances at the molecular level. Ceramics, for instance, have long been limited by their brittleness. But by minimizing the microscopic imperfections that cause it, scientists are making far stronger ceramics that still retain such qualifies as hardness and heat resistance. Ford Motor Co. now uses ceramic tools to cut steel. A firm called Kyocera has created a line of ceramic scissors and knives that stay sharp for years and never rust or corrode.
A similar transformation has overtaken plastics. High-strength polymers now form. bridges, ice skating rinks and helicopter rotors. And one new plastic that generates electricity when vibrated or pushed is used in electric guitars, touch sensors for robot hands and karate jackets that automatically record each punch and chop. Even plastic litter, which once threatened to permanently blot the landscape, has proved amenable to molecular tinkering. Several manufacturers now make biodegradable forms; some plastic six-pack rings for example, gradually decompose when exposed to sunlight. Researchers are developing ways to make plastics as recyclable as metal or glass. What's more, composites—plastic reinforced with fibres of graphite or other compounds--made the round-the-world flight of the voyager possible and have even been proved in combat: a helmet saved an infantryman's life by deflecting two bullets in the Grenada invasion.
Some advanced materials are old standard with a new twist. The newest fiberoptic cables that carry telephone calls cross-country are made of glass so transparent that a piece of 100 miles thick is clearer than a standard window pane.
But new materials have no impact until they are made into products. And that transition could prove difficult, for switching requires lengthy research and investment. It can be said a firmer handle on how to move to commercialization will determine the success or failure of a country in the coming future.
How many new materials are mentioned in this passage？
A．Two.
B．Three.
C．Four.
D．Five.
第10题
● Every valid character in a computer that uses even（71） must always have an even number o
● Every valid character in a computer that uses even （71） must always have an even number of1bits.
（71）A. parity B. check C. test D. compare
● The maximum number of data that can be expressed by 8 bits is （72） .
（72）A. 64 B. 128 C. 255 D. 256
● Integration （73） is the process of verifying that the components of a system work together as described in the program design and system design specifications.
（73）A. trying B. checking C. testing D. coding
● GIF files are limited to a maximum of 8 bits/pixel, it simply means that no more than 256 colors are allowed in （74） .
（74）A. an image B. a file C. a window D. a page
● Computer （75） is a complex consisting of two or more connected computing units, it is used for the purpose of data communication and resource sharing.
（75）A. storage B. device C. network D. processor
