将投影面的平行线变换为投影面的垂直线时辅助投影轴必须选在与原投影体系中反映实长的那个投影相垂直的位置。( )
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考虑两台主机A和主机B由一条带宽为R bps、长度为M米的链路互连,信号传播速率为V m/s。数据帖长度为L,假设主机A从t=0时刻开始向主机B发送分组。 试求: 1)传播延迟(时延)dp; 2)传输延迟dt; 3)若忽略结点处理延迟和排队延迟,则端到端延迟de是多少? 4)若dp>dt,则t=dt时刻,分组的第一个比特在哪里?(注:1k=10^3,1M=10^6)
When you move out of the house, you should _________ the door keys to me.
A. hand in
B. hand out
C. hand over
D. hand around
I’ll show you how to accomplish each step _________ in the next several sections.
A. in turn
B. in fact
C. in place
D. in time
They will carry out this experiment, _________ what happens.
A. in front of
B. in favor of
C. in case of
D. regardless of