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【单选题】
设L为点〔a,0〕,沿X轴到点〔-a,0〕的直线段,则 dx为〔〕A.
B.
1
C.
-1
D.
0
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【简答题】设机器字长为 8 位,则 +50 的原码、反码、补码分别为 __________ 、 __________ 、 __________ ; − 50 的原码、反码、补码分别为 __________ 、 __________ 、 __________ 。
【简答题】The first time when he visited the online chat room was in 1998, when he was only 10 years old.
【单选题】He _____ with an American family when he visited the United States as a visiting scholar.
A.
lived
B.
inhabited
C.
resided
D.
boarded
【单选题】When he visited the house 50 years later，he found everything was _____ it had been before .
A.
that
B.
which
C.
same
D.
as
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【简答题】The first time when he visited the online chat room was in 1998, when he was only 10 years old.
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