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【简答题】
已知tanα、tanβ是方程 x 2 +3 3 x+4=0 的两根，且α、β ∈(- π 2 ， π 2 ) ，则tan（α+β）=______．
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举一反三
【简答题】Part III Directions: In this section, you’ll hear some passages. At the end of each passage, you'll hear some questions. Both the passage and the questions will be spoken only once. After each questio...
【简答题】Part IV Directions: In this section, you’ll hear some passages. At the end of each passage, you'll hear some questions. Both the passage and the questions will be spoken only once. After each question...
【单选题】第15-17题图.docx The table in the above figure shows the levels of output resulting from different levels of inputs. Returns to scale are greatest at which level of output? ______
A.
100-200 units
B.
400-600 units
C.
200-400 units
D.
There is insufficient information to answer the question
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【单选题】设异步串行通信时，每个字符对应1个起始位，7个信息位，1个奇/偶校验位和2个停止位，每秒传送这样字符240个，其波特率为（）b/s。
A.
2400
B.
2640
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1200
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1920
【单选题】Section B Directions: In this section, you will hear several short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. Afte...
A.
They get close to nature.
B.
They are usually healthier than city people.
C.
They get better and cheaper farm products.
D.
They are more polite than city people.
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【单选题】设异步串行通信时,每个字符对应1个起始位,7个信息位,1个奇/偶校验位和2个停止位,每秒传送这样字符240个,其波特率为( )。
A.
2640bps
B.
2400bps
C.
1920bps
D.
1200bps
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