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【单选题】
对于R进制数,若小数点左移一位,则该数(),若小数点右移一位,则该数()。A.
缩小R倍,扩大R倍
B.
扩大R倍,缩小R倍
C.
缩小R倍,缩小R倍
D.
扩大R倍,扩大R倍
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举一反三
【单选题】When is the Han Dragon Boat Festival?
A.
The fifth of the fifth lunar month.
B.
The 4th of the fifth lunar month.
C.
From the 24th to the 27th of the fifth lunar month.
D.
From the 14th to the 17th of the fifth lunar month.
【单选题】只有频率在( )范围内的声音人耳才能感觉到,即才能引起听觉。
A.
20~20000Hz
B.
10~20000Hz
C.
20~2000Hz
D.
200~20000Hz
【单选题】When using a hand held smoke signal from a lifeboat, you should activate the signal _____.
A.
at the stern
B.
on the upwind side
C.
inside the boat
D.
on the downwind side
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