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光电二极管能将（）信号转变为（）信号，它工作时需加反向偏置电压。
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【简答题】在PowerPoint 2000中可以利用______、______和______等三种方法创建演示文稿。
【简答题】短文填词。 When a young man starts to earn his own living,he can no longer expect others to pay _____ his food, his clothes, or his room, but he has to work if he wants to live _____(舒适)．If he spends most ...
【单选题】He _____ football regularly for many years when he was young.
A.
played
B.
was playing
C.
has played
D.
had played
【简答题】化简逻辑函数Y=A'BC'+AC'+B'C',结果为:
【单选题】PowerPoint 2000中,执行“文件/关闭”命令,则( )。
A.
关闭PowerPoint 2000窗口
B.
关闭正在编辑的演示文稿
C.
退出PowerPoint 2000
D.
关闭所有打开的演示文稿
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