单项选择题
A.前向一体化 B.后向一体化 C.横向一体化 D.横向多元经营
在光学分析法中,采用钨灯作光源的是()。A.原子光谱B.紫外光谱C.可见光谱D.红外光谱
单项选择题在光学分析法中,采用钨灯作光源的是()。
A.原子光谱 B.紫外光谱 C.可见光谱 D.红外光谱
22()A.demandB.askC.pressD.seek
单项选择题22()
A.demand B.ask C.press D.seek
Ancient people felt much()concerning the notion that th...
单项选择题Ancient people felt much()concerning the notion that the appearance of comets was inauspicious, but nevertheless exhibited () concerning the proper reaction to the phenomenon.
A.conviction ... apprehension B.apathy... ignorance C.disparity... discord D.consensus ... disagreement E.suspicion... hesitancy