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【单选题】
下面的（）不属于分光光度计的基本部件，而只是部件中的零件。A.
单色器
B.
光源
C.
检测系统
D.
光电管
手机使用
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举一反三
【简答题】如图所示电路中，N为线性有源二端网络，测得A，B之间电压为9V，如图(a)所示；若连接如图(b)所示，可测得电流I =1A。现连接成图(c)所示形式，问电流I 为（）A。【图片】
【简答题】如图所示电路，元件A的伏安特性为U=I 2 +1(I＞0)，求电流I和I 1 。
【简答题】听力原文：Every Roman town had a forum at its centre, where people came together to conduct their official and religious affairs. In addition, the forum was used as a meeting place. (83)
【简答题】Each town had its "fast" set which prided itself on its unconventionality... (Para.8)
【简答题】The town is famous for its magnificent church towers.
【简答题】某闭合电路中，电源的电压为定值，电流I（A）与电阻R（Q）成反比例，其图象如图所示，电流I与电阻R的函数关系式为______．
【单选题】Before the telephone was ______ , man had no way of talking to each other except face to face.
A.
invented
B.
discovered
C.
installed
D.
created
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