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【简答题】
负整数的补码求取:将对应的正整数采用二进制原码表示,然后按位取反,再加1。补码的求取结果与存储采用的位数有关,如采用8位存储,-1的补码计算过程为:0000 0001->1111 1110->1111 1111,即-1的补码为1111 1111;而若采用16位存储,则-1的补码计算过程为,0000 0000 0000 0001->1111 1111 1111 1110->1111 1111 1111 1111,即-1的补码为1111 1111 1111 1111;请问如果采用4个字节即32位存储,-1的补码为__________;如果采用1个字节的8位存储,-127的补码为______,-128的补码为___________。
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【单选题】—I feel tired and sleepy. —Why not stop ____ for a while? [ ]
A.
rest
B.
to rest
C.
resting
D.
rested
【单选题】Tom went into a restaurant to _______ ．
A.
buy glasses
B.
have lunch
C.
buy some books
D.
sell glasses
【单选题】—I feel tired and sleepy. —Why not stop ______? [ ]
A.
to relax
B.
relaxing
C.
resting
D.
to relaxed
【单选题】Tom wanted to buy a new computer, but he couldn’t _____ it. [ ]
A.
buy
B.
pay for
C.
afford
D.
spend
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