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【单选题】
已知定义域为R的函数f（x）对任意实数x、y满足f（x+y）+f（x-y）=2f（x）cosy，且 f(0)=0，f( π 2 )=1 ．给出下列结论： f( π 4 )= 1 2 ；②f（x）为奇函数；③f（x）为周期函数；④f（x）在（0，x）内单调递减．其中正确的结论序号是（ ）A.
②③
B.
②④
C.
①③
D.
①④
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举一反三
【单选题】Oil companies in the U.S. are already beginning to feel the pressure. Refinery workers are being _______.
A.
laid out
B.
laid off
C.
laid down
D.
laid aside
【单选题】Oil companies in the U.S. are already beginning to feel the pressure. Refinery workers and petroleum equipment manufacturing employees are being _____.
A.
laid out
B.
laid off
C.
laid down
D.
laid aside
【单选题】关于独特型,下述哪项是错误的?
A.
是Ig分子V区和T、B细胞表面抗原受体V区所具有的抗原特异性标志
B.
其决定簇由Ig超变区特有的氨基酸序列和构型所决定
C.
它与Ig分子和抗原结合特性无关
D.
它和超变区的物质结构基础相同
E.
在一定条件下,其决定簇可刺激机体产生抗独特型抗体
【简答题】翻译 “你出去啊?”“啊,出去一下。”
【判断题】Shell Oil Company is the United States-based subsidiary of Royal Dutch Shell, a multinational "oil major" of Anglo-Dutch origins, which is amongst the largest oil companies in the world.
A.
正确
B.
错误
【简答题】Oil companies in the US are already beginning to feel thepressure. Refinery workers and petroleum-equipment-manufacturing employees arebeing ___.A. laid out B. laid off C. laid down D. laid aside
【简答题】英文句子求翻译啊啊As far as hobbies are concerned, Jane and her sister nearly have nothing in common
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