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【多选题】
plot(x,y) 叙述错误的是A.
x,y的元素数量必须相同
B.
x,y必须向量
C.
x,y必须是数值
D.
x是横坐标的取值，y是纵坐标的取值
E.
plot(y,x) 绘制的图像与plot(x,y) 绘制的图像关于直线y=x对称
F.
plot(x,y) 绘制的是虚线
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举一反三
【单选题】They boy said ________ couldn’t he work out the problem but his teacher didn’t know how to do it.
A.
though
B.
never
C.
hardly
D.
not only
【单选题】To gure out how the brain stamps a behavior as one to make a habit, the M.I.T. lab began recording the electrical activity of small collections of neurons (brain cells) in the striatum.
A.
fixes a postage stamp on to (a letter)
B.
makes something by cutting it out with a die or mould
C.
brings down (one’s foot) heavily on the ground
D.
impresses a mark on a surface using an engraved or inked block or die or other instrument
【单选题】The proper title for this passage should be ______.
A.
How to Work Out Maths Problems
B.
How to Get Exact Figures
C.
How to Answer a Question
D.
How to Read Maths Problems
【单选题】The students didn t manage to work out the problem ______ their teacher had explained how.
A.
when
B.
until
C.
unless
D.
as
【单选题】_____ bad weather it is today! You can't go out. [ ]
A.
What
B.
What a
C.
How
D.
How a
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