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【单选题】
根据左视图,选择正确的剖视图A-A。A.
（1）
B.
（2）
C.
（3）
D.
None
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举一反三
【单选题】图 13 所示电路,其中边沿 D 触发器中的 R 、 S 为直接清零端和直接置 1 端,高电平有效,触发器的初始状态为 0 。则当 CP 时钟第 6 个上升沿触发后,触发器的状态 为( )。
A.
1110
B.
0111
C.
0011
D.
1100
【单选题】南京古泉生态农场是生态农业的典范。该农场将养猪、养鱼、沼气工程、养鸭、种植农作物、养蘑菇、种桑养蚕、种植果树等多个生产过程合理地有机结合起来，成为一种高效良性的循环，生态效益达到了良性发展。请就此生态农场的特点，完成下列问题：
在该生态农场中存在如下图所示的物质循环过程，据图分析不符合生态工程原理的叙述是（）
A.
物质经过多级利用，实现了良性循环
B.
每一级生产环节都获得产品，提高了生态经济效益
C.
由于食物链延长，能量逐级损耗，系统总能量利用率降低
D.
由于各级产物都可以利用，减少了废物和污染
【单选题】How long did it take Byrd and his colleagues to fly from Little America to the South Pole and back?
A.
15 hours.
B.
16 hours.
C.
18 hours.
D.
19 hours.
【判断题】如图所示电路,其中边沿 D 触发器中的 R 、 S 为直接清零端和直接置 1 端,高电平有效,触发器的初始状态为 0 。则当 CP 时钟第 6 个上升沿触发后,触发器的状态 为 1110 。
A.
正确
B.
错误
【单选题】How long did it take Byrd and his colleagues to fly from Little America to the South Pole and back?
A.
19 hours.
B.
17 hours.
C.
18 hours.
D.
16 hours.
【单选题】How long did it take for the world's population to increase from 2 billion to 3 billion?
A.
304 years.
B.
123 years.
C.
33 years.
D.
14 years.
【简答题】“How many common English words were invented by Shakespeare?” How long did it take people to find the answer to this question 15 years ago? And now! you can google it and find the answer immediately! ...
【单选题】How long did it take the patient to resume her normal activity after the operation?
A.
24 hours.
B.
48 hours.
C.
About a week.
D.
Almost a month.
【简答题】“How many common English words were invented by Shakespeare?” How long did it take people to find the answer to this question 15 years ago? And now! You can google it and find the answer immediately! ...
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