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【多选题】
( 多选 ) 一列简谐横波沿着 x 轴正方向传播,波中 A 、 B 两质点在平衡位置间的距离为 0.5 m ,且小于一个波长,如图甲所示, A 、 B 两质点振动图像如图乙所示。由此可知 ( )A.
波中质点在一个周期内通过的路程为 8 cm
B.
该机械波的波长为 4 m
C.
该机械波的波速为 0.5 m /s
D.
t= 1.5 s 时, A 、 B 两质点的位移相同
E.
t= 1.5 s 时, A 、 B 两质点的振动速度相同
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举一反三
【单选题】If f and g are distinct prime numbers less than 10, which of the following cannot be the product of f and g?
A.
6
B.
9
C.
10
D.
14
E.
15
【单选题】Large numbers of farmers have poured into towns because___________________.
A.
they hope to have their own business
B.
the rural areas are too crowded with people
C.
they are unhappy with their life in the country
D.
they can hardly support their families on farms
【简答题】Numbers are very important in our life. Now we use numbers every day. Numbers are______important in our life______we use them every day.
【单选题】numbers = range(-5,5) f = filter(lambda x:x>0,numbers) print(list(f))
A.
[1, 2, 3, 4,5]
B.
[-5,-4,-3,-2,-1,1, 2, 3, 4,5]
C.
[1, 2, 3, 4,]
D.
[-4,-3,-2,-1,1, 2, 3, 4]
【多选题】What information going with numbers should be interpreted to convey the meaning of numbers?
A.
Unit of numbers
B.
What numbers refer to
C.
Certain trends that numbers may indicate
D.
No option here. Please choose among A, B and C.
【简答题】Large numbers of fish swimming near the suce of the water may indicate the possible occ_________ of an earthquake.
【简答题】Between 2000 and 2001 both countries had similar numbers of employees, but by 2002 numbers in England had fallen to half as many as in Germany.
【简答题】What is the value of the greater of two numbers if one of the numbers is three times the smaller number? (1) One of the numbers is 12. (2) The sum of the two numbers is 16.
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