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[单选题]
PDF417（Portable Data Files，即便携数据文件)是（)。 A．一维条码 B．二维条码 C．三维条码
A.A.一维条码
B.B.二维条码
C.C.三维条码
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题目内容
（请给出正确答案）
A.A.一维条码
B.B.二维条码
C.C.三维条码
答案
更多“PDF417（Portable Data Files，即便携数据文件)是（)。 A．一维条码 B．二维条码 C．三维条码”相关的问题
第1题
从供选择的答案中选出应填入下面一段英文中______内的正确答案。
Bluetooth is a telecommunications industry(1)specification that describes how mobile phones, computers, and personal digital assistants (PDAs) can be easily interconnected using a short-range(2)wireless connection. Using this technology, users of cellular phones, pagers, and personal digital assistants can buy a three-in-one phone that can(3)double as a portable phone at home or in the office, get quickly(4)synchronized with information in a desktop or notebook computer, initiate the sending or receiving of a fax, initiate a print-out, and, in general, have all mobile and fixed computer devices be totally(5)coordinated.
Bluetooth requires that a low-cost transceiver chip be included in each device. The transceiver(6)transmits and receives in a previously unused frequency band of 2.45 GHz that is available(7)globally (with some variation of bandwidth in different countries), In addition to data, up to three voice(8)channels are available. Each device has a unique 48-bit address from the IEEE 802 standard. Connections can be point-to-point or(9)multipoint. The maximum range is 10 meters. Data can be exchanged at a rate of 1 megabit per second (up to 2 Mbps in the second generation of the technology). A frequency hop scheme allows devices to(10)communicate even in areas with a great deal of electromagnetic interference. Built-in encryption and verification is provided.
供选择的答案：
1．globally 2．coordinated 3．multipoint 4．communicate 5．specification
6．transmits 7．wireless 8．double 9．channels 10．synchronized
第5题
A.petrol
B.portable
C.portfolio
D.port
第6题
A、portable
B、primary
C、possession
D、positive
第10题
The passage is about ______.
A．the Indian way of living
B．tropical regions
C．Indians' gift for the Europeans
D．a portable bed
第11题
This instant dictionary(快译通) is too_____He can't afford it, to say nothing of a portable computer (手提电脑).
A．dearly
B．expensive
C．costly
D．high
