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【单选题】
从单证的用途来分,大致可以分为商业单据(商业发票、装箱单等)、货运单据(海运提单、空运单、托运单等)、官方单据(原产地证书、海关发票、检验检疫证书等)以及( )等。A.
保险单据和金融单据(汇票、支票和本票等)
B.
物流单据
C.
文件与凭证
D.
保险单
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【简答题】History of Computers Computers are devices that are used to carry out tasks that people want done in a more efficient and usually faster way than can be done by the human brain. There are two types of...
【多选题】According to the functional feature of interface, there are , different interfaces.
A.
z ero interface
B.
passive interface
C.
active interface
D.
intelligent interface
E.
digital interface
F.
analog interface
【简答题】to convert og signal into digital signal, there are three steps: , , .
【简答题】Translate the following passages into Chinese There are many ways to modulate a signal, such as Amplitude Modulation (AM), Frequency Modulation (FM), Phase Modulation (PM), and Pulse Modulation. Both ...
【单选题】There are ten analog signals, each of bandwidth B=4kHz. Samples of these signals are time-division-multiplexed, quantized and binary-coded. If the number of quantization levels L is 200, the step size...
A.
1, 1/3
B.
1, 1/2
C.
2, 1/3
D.
2, 1/2
【判断题】There are analog-to-digital and digital-to-analog chips, DSP chip, microprocessor chip, ROM and flash memory chips, and other chips on the circuit board.
A.
正确
B.
错误
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