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河岸权原则是指土地所有权人对与其土地相毗邻的河流享有对应的,故生活在江河湖泊边的人们可随意开发利用水资源A.
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B.
错误
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【简答题】学习中国旅游地理的方法？
【单选题】During the 1990s, the price of SUVs rose and each year more were purchased. This suggests that ________.
A.
there must have been technological advances in the way SUVs were produced.
B.
the “law of demand” does not hold in this market.
C.
there must have movement leftward along the supply curve for SUVs.
D.
there must have been a rightward shift of the demand curve for SUVs.
【简答题】5—21假定使用连续ARQ协议中,发送窗口大小是3,而序列范围[0,15],而传输媒体保证在接收方能够按序收到分组。在某时刻,接收方,下一个期望收到序号是5.试问: (1)在发送方的发送窗口中可能有出现的序号组合有哪几种? (2)接收方已经发送出去的、但在网络中(即还未到达发送方)的确认分组可能有哪些?说明这些确认分组是用来确认哪些序号的分组。
【简答题】假定使用连续 ARQ 协议,发送窗口大小是 3 ,而序号范围是 [0,15] ,而传输媒体保证在接收方能够按序收到分组。在某一时刻,在接收方,下一个期望收到的序号是 5 。试问: ( 1 )在发送方的发送窗口中可能出现的序号组合有哪些种? ( 2 )接收方已经发出的、但仍滞留在网络中(即还没到达发送方)的确认分组,可能有哪些?说明这些确认分组是用来确认哪些序号的分组。
【单选题】On most days the price of a rose is $1 and 80 roses are purchased. On Valentine's Day the demand increases so that the price of a rose rises to $2 and 320 roses are purchased. Therefore, the price ela...
A.
demand for roses is about 1.8.
B.
demand for roses is about 0.55.
C.
supply of roses is about 1.8.
D.
supply of roses is about 0.55.
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