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【简答题】
对于一个三阶常系数线性微分方程描述的连续时间系统进行模拟时，所需要的积分器数目最少为（ ）个。（答案使用阿拉伯数字）
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举一反三
【简答题】Big Ben is the nickname for the great bell of the clock in London. The name was given in honor of Sir Benjamin Hall, who was in charge of the works when the bell was installed in 1856. The clock has b...
【单选题】In the last paragraph, people are recommended to have ______.
A.
foods containing large quantities of refined flour and vegetables
B.
foods with fibers removed
C.
foods with more fibers
D.
food with additives
【单选题】Our physics teacher explained to us that light______faster than sound.
A.
is traveling
B.
traveled
C.
travels
D.
has traveled
【单选题】. — I ‘ll ask our physics teacher to explain Newton’s Second Law of Motion, which she taught us yesterday. — That’s just _______ most of the students haven’t understood.
A.
what
B.
why
C.
how
D.
where
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