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【单选题】
下列概念表述正确的是（ ）A.
单项式ab的系数是0，次数是2
B.
单项式-2 3 a 2 b 3 的系数是-2，次数是5
C.
-4a 2 b，3ab，5是多项式-4a 2 b+3ab-5的项
D.
xy-1 3 是二次二项式
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【单选题】By 'the pendulum is swinging too far', Ian Perry probably means
A.
the number of houses sold by each agent is the lowest in history.
B.
the house market is bound to suffer because of the high interest rates.
C.
both Mr. King and the media worried too much over the price falls.
D.
the Bank and the media are helping push the house prices further down.
【单选题】__________________________________ Before pendulum clocks were invented, Peter Henlein of Germany invented a spring-powered clock around 1510. It was not very precise. The first clock with a minute ha...
A.
Dividing the day into hours, minutes,and seconds
B.
Using the sun
C.
Dividing the year into months and days
D.
Sundial clocks
E.
Water clocks
F.
Pendulum clocks
【单选题】It is implied by 'The pendulum swung far right during the 1990's...'that______.
A.
it was no easy task to change what Americans thought about divorce in the 1990's
B.
parents in the 1990's would think twice before they got divorced
C.
people were discouraged to get divorced by the 1990's law
D.
people could resort to law to regulate family relations
【单选题】In the last paragraph, the word 'pendulum' means______.
A.
temporary balance of powers
B.
vibration of powers
C.
dangling of powers
D.
equality of powers
【简答题】translate pendulum
【简答题】A pendulum clock depends on the period of a pendulum to keep correct time. Suppose a pendulum clock is keeping correct time and then you slide the bob of the pendulum downward on the oscillating rod. ...
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