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【多选题】
下面是可燃冰形成的必要条件的是?
A.
低温
B.
高压
C.
气源
D.
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举一反三
【单选题】Thirty computers have been sent to the school some other new teaching equipment. [     ]
A.
in addition
B.
in addition to
C.
such as
D.
more than
【单选题】Computers have been getting more popular ______.
A.
because the Americans want to appear rich
B.
because they are smaller, cheaper and easier to use
C.
because they can help Americans do everything
D.
because 'they can type letters
【判断题】人的假定不同会导致一些列行为规范的不同。()
A.
正确
B.
错误
【单选题】以下标识符不是关键字的是()。
A.
break
B.
char
C.
Switch
D.
Return
【单选题】执行 PUSH ACC 指令, MCS-51 完成的操作是 ( )
A.
SP+1 → SP ,( ACC )→( SP );
B.
( ACC )→( SP ), SP - 1 → SP
C.
SP - 1 → SP ,( ACC )→
D.
( ACC )→( SP ), SP+1 → SP
【单选题】执行PUSH ACC指令,MCS—51完成的操作是( )
A.
SP+1一>SP  (ACC)一>(SP)
B.
(ACC)一>(SP) SP-1一>SP
C.
SP-1一>SP  (ACC)一>(SP)
D.
(ACC)一>(SP) SP十1一>SP
【单选题】Before he arrived at the airport, the plane______.
A.
would get off
B.
got off
C.
had got off
D.
has got off
【判断题】乔峰的悲剧包含着家国矛盾的悲剧、个人情感的悲剧、命运的悲剧。
A.
正确
B.
错误
【判断题】乔峰的悲剧包含着家国矛盾的悲剧、个人情感的悲剧、命运的悲剧。
A.
正确
B.
错误
【单选题】Computers have been getting more popular because______ .
A.
they can type letters
B.
they can help Americans do everything
C.
the Americans want to appear rich
D.
they are smaller, cheaper and easier to use
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