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【单选题】
以太网中，第3次冲突之后，一个节点选择的随机退避系数r的值为4的概率是A.
1/4
B.
1/8
C.
1/16
D.
1/32
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【简答题】10-10 波源作简谐振动,其运动方程为 y=4.0x10^-3cos(240 ) ,式中 y的单位为 m,t 的单位为 s,它所形成的波以30 m/s的速度沿一直线传播. (1)求波的周期及波长; (2) 写出波动方程.
【单选题】The findings of the study of American Express suggest that
A.
most small-business owners produce creative ideas during vacations.
B.
the ideas that come out during vacations are sure to promote business.
C.
some people can be more creative and productive during leisure time.
D.
spending time outside office doesn't detract from work success.
【单选题】Which of the following sentences is INCORRECT?
A.
The findings of the court have now been made public.
B.
When was the United Nations established?
C.
The Olympic Games begins in two years' time.
D.
The minutes of the meeting were read and confirmed.
【单选题】The findings of the two studies contradict each other, though both groups of scientists have used the same method.
A.
agree with
B.
confirm
C.
complement
D.
disagree with
【简答题】波源作简谐运动,振幅为500px,周期为0.02s,若该振动以100 m ·s 的速度沿一直线传播。设t=0时,波源处的质点经平衡位置向正方向运动。(1)写出波动方程(2)求距波源5.0m处质点的运动方程和初相
【多选题】一个设计完成的标志可以有哪几种文字和图形的表现形式?
A.
纯文字的，如：三星公司的商标、Prada公司的商标........
B.
纯图案的，如：丰田汽车公司的标志、奔驰公司的标志......
C.
文字和图案相结合的，如：北面服装公司的商标、星巴克咖啡厅商标......
【单选题】Which of the following can't be inferred from the findings of the researchers?
A.
Hurricane activity is indeed quite sensitive to climate.
B.
La Nina events prevent more intense and frequent storms from happening.
C.
Current climate conditions resemble those that led to peak Atlantic hurricane activity about 1000 years ago.
D.
The increase in storm intensity and climate change are linked.
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