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【简答题】
已知 X 和 Y ,用变形补码计算 X+Y 和 X-Y ,并指出运算结果是否溢出: (1) X=0.11011 , Y=0.11111
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举一反三
【单选题】Why has Mary been absent from class?
A.
She has been ill.
B.
She has been in Mexico.
C.
Some relatives have been visiting her.
【单选题】I learned _____ the city for a long time. [ ]
A.
she has been to
B.
she has gone to
C.
she had been in
D.
she had gone to
【简答题】()是日本大正年间产生的一种独特小说形式,又称“自我小说”。
【简答题】A．She has been working a lot recently. B．She has been taking care of her sick mother. C．She has been taking two night classes. D．She has been looking for a new job.
【简答题】How many years has she been married?She has been married ______.
【单选题】Every means ______ since then.
A.
has been trying
B.
have been trying
C.
have been tried
D.
has been tried
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