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【单选题】
Which of the following modulations is for the VHF radio telephone?A.
G3E
B.
F3E
C.
G2B
D.
F1B
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反馈参考答案：
举一反三
【简答题】为什么要设置“加力牵引坡度”??
【单选题】The flow control in which the destination can stop the flow of data simply by withholding acknowledgment of the receipt of a frame is ________ flow control
A.
data
B.
stop - and - wait
C.
frame acknowledgment
D.
ARQ
【简答题】data flow
【单选题】Which of the following tools presents data or information flow within an information system?
A.
Grid chart
B.
Top-down analysis method
C.
Automated design tool
D.
Data flow diagram
【简答题】A. ni ăonà B. niăonuó C. níaonuó
【单选题】已知 ψ y (Ni 2+ / Ni)= -0.257V, 测得镍电极的 j (Ni 2+ / Ni)= -0.210V ,说明在该系统中 c (Ni 2+ )
A.
c (Ni 2+ ) > 1.0 mol·kg -1
B.
c (Ni 2+ ) <1.0 mol·kg -1
C.
c (Ni 2+ ) =1.0 mol·kg -1
D.
c (Ni 2+ ) 无法确定
【单选题】The primary tool for representing a system's component processes and the flow of data between them is the
A.
data dictionary.
B.
process specifications diagram.
C.
user documentation.
D.
data flow diagram.
E.
top down structure chart.
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