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【单选题】
Which of the following best expresses the essential information in the highlighted sentence? Incorrect answer choices change the meaning in important ways or leave out essential information. (The discovery of both small and large animals in the creek bed suggests that the cause of the extinction of these giant animals was a massive shift in climate).A.
Whenever there are large temperature fluctuations small and large animals die in equal numbers.
B.
Animal remains found in a creek bed seem to show that there was a climate shift after the extinction of large and small animals
C.
The reason for the disappearance of large animals, as evidence from a riverbed shows, can be tied to changing climate.
D.
Researchers have found evidence of a drastic climate change by studying large and small animal remains.
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【简答题】韦伯定律
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【简答题】韦伯定律
【简答题】m和n互为相反数，p和q互为倒数，则3（m+n）﹣pq的值为（ ）．
【简答题】韦伯定律
【简答题】植树节到了，张老师带领同学们在一条长100米的路的一边栽柳树，每隔5米栽1棵，如果两端都栽，一共要栽多少棵柳树？
【简答题】国标规定:凡是由硅酸盐水泥熟料、 的石灰石或粒化高炉矿渣、适量石膏磨细制成的水硬性胶凝材料,称为硅酸盐水泥。
【单选题】若a、b互为相反数，且a、b均不为0，n为正整数，则下列结论正确的是
A.
a2n和b2n也一定互为相反数
B.
an与bn一定互为相反数
C.
－a2n与－b2n也一定互为相反数
D.
a2n＋1与b2n＋1也一定互为相反数
【简答题】m和n互为相反数，p和q互为倒数，则 的值为_______．
【简答题】由硅酸盐水泥熟料、0～5%石灰石或粒化高炉矿渣、适量石膏磨细制成的水硬性胶凝材料，称为()。 A硅酸盐水泥 B普通硅酸盐水泥 C矿渣硅酸盐水泥 D石灰石水泥