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【单选题】
向量的正().A.
(1,0,1)
B.
(-1,0,1)
C.
(-1,0,2)
D.
(2,0,1)
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【简答题】I tried to fight against my desire to eat chocolate, but I couldn’t. (go against) →
【单选题】采用成组设计t检验的条件是:
A.
样本均数与总体均数的比较,总体标准差 已知且样本含量较小( )
B.
样本均数与总体均数的比较,总体标准差 未知且样本含量较小( )
C.
两样本均数比较,两样本差值来自正态总体并且差值的总体均数为0
D.
两样本均数比较,两样本均来自正态分布总体,且两样本总体方差相等
E.
两样本均数比较,两样本均来自正态分布总体,且两样本总体方差已知
【单选题】How do drugs help people stop smoking work?
A.
They act on smokers' brain.
B.
They fight against nicotine directly.
C.
They have the same effect on dopamine as nicotine does.
D.
They counteract the effect on dopamine made by nicotine.
【单选题】Vibrations in the ground are a poorly understood but probably widespread means of communication between animals. It seems unlikely that these animals could have detected seismic 'pre-shocks' that were...
A.
the world’s earthquake laboratories were not effective in detecting seismic 'pre-shocks'.
B.
seismic signaling was the major communication form. of many animal species.
C.
those animal species can feel and understand all kinds of vibrations.
D.
all storage animal behaviors can be explained by extra-sensory perception.
【简答题】The soldiers tried their best and did what they could _______ against the flood. A．fight B．to fight C．fighting D．fought
【简答题】I tried to fight against my desire to eat chocolate, but I couldn’t. (go against) 改为:
【单选题】The two dogs started to fight, so we tried to _____ them.
A.
split
B.
separate
C.
tear
D.
divide
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