光纤通信中最常用的光电检测器有（）A.LED和LD B.PIN和APD C.LD和A 发布时间：2019-09-22 17:59 │ 来源：www.tikuol.com 题型：单项选择题 问题： 光纤通信中最常用的光电检测器有（）A.LED和LDB.PIN和APDC.LD和APD
题型：单项选择题 据《史记》载:“故天子有田以处其子孙,诸侯有国以处其子孙,大夫有采以处其子孙,是谓制度。”由此可见该制度( )A．确立了嫡长子继承制B．使土地和政治权力层层分割C．确立了中央集权制D．扩大了国家疆域 查看答案
题型：单项选择题 从方框内选择最佳选项，并把字母序号写在对话后面的空格内。（方框中有两个选项与对话内容无关）A: Can I help you? B: What kind of noodles would you like?C: We have small, medium and large. D: And what size would you like?E: I’d like mutton and potato noodles, please.A: ___66____.B: I’d like some noodles, please.A: ____67___B: What kind of noodles do you have?A: We have beef, chicken, mutton, cabbage, potato , tomato….B: Ok, ___68___A: Sure. ____69____B: What sizes do you have?A: ____70___B: Oh, a medium bowl, please. 查看答案
题型：单项选择题 在窗体上画一个名称为C1的命令按钮，然后编写如下事件过程： Private Sub C1_Click() a＝0 n＝InputBox("") For i＝l To n Forj＝l To i a＝a+1 Next j Next i Print a End Sub 程序运行后单击命令按钮，如果输入4，则在窗体上显示的内容是( )。A．5B．6C．9D．10 查看答案