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【单选题】
进行一氯取代反应后，只能生成3种沸点不同的产物的烷烃是 [ ]A.
(CH 3 ) 2 CHCH 2 CH 2 CH 3
B.
(CH 3 CH 2 ) 2 CHCH 3
C.
(CH 3 ) 2 CHCH(CH 3 ) 2
D.
(CH 3 ) 3 CC(CH 3 ) 2 C(CH 3 ) 3
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举一反三
【单选题】Why don’t you _____ your teacher for help when you can’t finish _____ it by yourself ?
A.
ask; write
B.
to ask; writing
C.
ask; writing
D.
asking; write
【简答题】在 8086 系统中,逻辑地址 FFFF:0001 、 00A2:37F 和 B800:173F 的物理地址 分别是多少?
【简答题】汉代选拔官吏制度的形式是__。从隋代到明清,历代封建王朝通过考试选拔官吏的制度是__。
【单选题】—You can ask your father for help. —He has gone to England. If he _ at home, I ask you. [ ]
A.
is, won't
B.
was, won't
C.
were, wouldn't
【简答题】什么是逻辑地址？什么是物理地址？8086系统中物理地址为多少位？
【单选题】Did you ask the teacher ________ the day before?
A.
what was happened to her
B.
what she had happened
C.
what she happened
D.
what had happened to her
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