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【多選題】
已知雨滴下落過(guò)程中受到的空氣阻力與雨滴下落速度的平方成正比，用公式表示為f=kv2。假設(shè)雨滴從足夠高處由靜止豎直落下，則關(guān)于雨滴在空中的受力和運(yùn)動(dòng)情況，下列說(shuō)法正確的是
A.
雨滴受到的阻力逐漸變小直至為零
B.
雨滴受到的阻力逐漸變大直至不變
C.
雨滴受到的合力逐漸變小直至為零，速度逐漸變小直至為零
D.
雨滴受到的合力逐漸變小直至為零，速度逐漸變大直至不變
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舉報(bào)參考答案：
舉一反三
【單選題】Before each lesson finishes, the student has to_______________________ .
A.
get up and take breakfast
B.
be woken up by a loud voice
C.
listen to the lesson again in sleep
D.
review (復(fù)習(xí)) the lesson by himself
【單選題】What do we know about the flat?
A.
It has a big garden.
B.
It has a small garage.
C.
It has two double beds.
【單選題】In the experiment, lessons were given___________________________ .
A.
in the night time
B.
after lullabies were broadcast
C.
while the student was awake
D.
all through the twelve hours
【單選題】The purpose of the passage is to tell us that ________.
A.
man are smarter then women
B.
man are more stupid the women
C.
a new fact about the IQ of men and women has been found
D.
men are more likely to receive first class university degrees
相關(guān)題目：
【單選題】Before each lesson finishes, the student has to_______________________ .
A.
get up and take breakfast
B.
be woken up by a loud voice
C.
listen to the lesson again in sleep
D.
review (復(fù)習(xí)) the lesson by himself
【單選題】What do we know about the flat?
A.
It has a big garden.
B.
It has a small garage.
C.
It has two double beds.
【單選題】In the experiment, lessons were given___________________________ .
A.
in the night time
B.
after lullabies were broadcast
C.
while the student was awake
D.
all through the twelve hours
【單選題】The purpose of the passage is to tell us that ________.
A.
man are smarter then women
B.
man are more stupid the women
C.
a new fact about the IQ of men and women has been found
D.
men are more likely to receive first class university degrees
參考解析：
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