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【单选题】
在活性炭吸附醋酸分子的实验中吸附剂和吸附质分别是什么?A.
活性炭，醋酸分子
B.
活性炭，活性炭
C.
醋酸分子，醋酸分子
D.
醋酸分子，活性炭
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举一反三
【单选题】Which of the following statements in relation to liquidated damages is correct?
A.
Parties to a contract must stipulate an amount of money as liquidated damages
B.
A party to a contract may claim liquidated damages and deposit where the other party breaches the contract
C.
Where they are significantly higher than the damages incurred, a party may petition the court to make an appropriate reduction
D.
They are a form of punishment in nature
【简答题】在上图中所示电路中，由于电路参数不同，在信号源电压为正弦波时，测得输出波形如下图(a)，(b)，(c)所示。试说明电路分别产生了什么失真，如何消除。
【简答题】试求图中所示电路中电压源的角频率为何值时，功率表W的读数为零(图中元件的参数已知)。
【单选题】Which of the following statements correctly describe the relation between a t-distribution (short for T) and a standard normal distribution (short for N)?
A.
N is centered （中心） at 0, whereas T is centered at n-1
B.
N has a larger standard deviation （标准差） than T
C.
N is just another name of T
D.
T has a larger standard deviation than N
【单选题】Relation of substitutability is also called ____________.
A.
chain relation
B.
syntagmatic relation
C.
paradigmatic relation
D.
word order
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