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【单选题】
理想电压源的特点是()。A.
内阻为0
B.
内阻为无穷大
C.
内阻是随机的
D.
内阻随负载变化
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【简答题】影响消费者购买行为的主要因素有( )。 A 、文化因素 B 、社会因素 C 、个人因素 D 、心理因素 E 、人际因素
【简答题】影响消费者购买行为的主要因素有( )。 A 、文化因素 B 、社会因素 C 、个人因素 D 、心理因素 E 、人际因素
【单选题】— When did Mr Green teach in China? — _______.
A.
Since five years ago
B.
For five years
C.
In five years
D.
Five years ago
【单选题】She is a girl. [ ]
A.
five years
B.
five years old
C.
five-year-old
D.
five-years-old
【单选题】阅读短文，回答问题：BIn 1784， five years before he became president of the United States， George Washington，52， was nearly toothless. So he hired a dentist to transplant nine teeth into his jaw——having ex-tract...
A.
show the primitive medical practice in the past
B.
demonstrate the cruelty of slavery in his days
C.
stress the role of slaves in the U.S. history
D.
reveal some unknown aspect of his life
【单选题】根据下列文章，回答36～40题。In 1784, five years before he became president of the United States, George Washington, 52, was nearly toothless. So he hired a dentist to transplant nine teeth into his jaw - having e...
A.
show the primitive medical practice in the past.
B.
demonstrate the cruelty of slavery in his days.
C.
stress the role of slaves in the U.S. history.
D.
reveal some unknown aspect of his life.
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