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【单选题】
— How about going fishing? — ____________, I have no patience for that.A.
Excuse me
B.
Sorry
C.
Pardon
D.
Apologize
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举一反三
【简答题】凸透镜能使平行于主光轴的光线会聚于一点，这一点叫做凸透镜的______，这一点到凸透镜光心的距离叫做______．
【简答题】使传函等于零的点叫做( )。
【简答题】Edmund Halley was an English scientist who lived over 200 years ago. He studied the observations of comets (彗星) which other scientists had made. The orbit of one particular comet was a very difficult ...
【简答题】在正方形网格内，小格的顶点叫做格点．以点D、E为两个顶点，作出所有位置不同的格点三角形，使所作的格点三角形与△ABC全等．
【单选题】The observations of LIGO in this paper ( ) the existence of binary stellar-mass black hole systems.
A.
demonstrate
B.
illustrate
C.
predict
D.
simulate
【简答题】使 的点叫做( )。
【单选题】In what type of test is the variable of interest the difference between the values of the observations rather than the observations themselves?
A.
a test for the equality of variances from 2 independent populations
B.
a test for the difference between the means of 2 related populations
C.
a test for the difference between the means of 2 independent populations
D.
All of the above
【单选题】In what type of test is the variable of interest the difference between the values of the observations rather than the observations themselves?
A.
A test for the equality of variances from two independent populations.
B.
A test for the mean difference between two related populations.
C.
A test for the difference between the means of two independent populations.
D.
all the options are correct .
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