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【单选题】
声频率简称声频或频率,度量单位为赫兹(Hz)。人耳能感觉到的声音频率范围是( )。
A.
20~20000Hz
B.
200~20000Hz
C.
200~2000Hz
D.
20~2000Hz
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参考答案:
举一反三
【单选题】听力原文: London in the 17th century was very attractive, like many European cities of the time. There was a beautiful cathedral, St. Paul's, and a magnificent Town Hall, the Guildhall. Also, there were m...
A.
Near Town Hall.
B.
In a narrow, dirty street.
C.
Behind many attractive churches.
D.
On the south side of the River Thames.
【单选题】Many churches were involved in missionary ()
A.
behavior
B.
activities
【判断题】Historically, education in the UK was voluntary and many of the schools that existed were set up by churches.
A.
正确
B.
错误
【单选题】There were not many ______ or ______.
A.
towns; churches
B.
town; church
C.
towns; church
D.
town; churches
【单选题】有一多级放大器各级增益分别为10dB、20dB、10dB,则总增益为( )
A.
40dB
B.
-40dB
C.
2000dB
D.
-2000dB
【单选题】In our class, when the bell rang and the teacher closed his book, it was a ________ for everyone to stand up. [     ]
A.
signal
B.
chance
C.
mark
D.
measure
【简答题】In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up. A.signal B.chance C.mark D.measure
【单选题】. Many churches were involved in missionary activities. They want to______all people to their religion.
A.
change
B.
convert
C.
turn
D.
transform
【判断题】调心,是指练功者在练功过程中对自我精神意识和思维活动的心理调控,也就是常说的特异功能。
A.
正确
B.
错误
【单选题】All the following are closed class words EXCEPT______.
A.
conjunctions
B.
prepositions
C.
adjectives
D.
pronouns
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