问题
单项选择题
数据通信网的交换方式有电路交换和分组交换，下列网络中，（）不是分组交换方式。
A.X.25网
B.帧中继网
C.DDN网
D.ATM网
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
数据通信网的交换方式有电路交换和分组交换，下列网络中，（）不是分组交换方式。
A.X.25网
B.帧中继网
C.DDN网
D.ATM网
参考答案：C
Six mornings a week, Rajendra Prasad gets on his bicycle and starts work. He puts on his postman’s uniform(制服), and takes 小题1: to the desert villages of Rajasthan. He wears a turban on his head because the desert sun is very hot. When he gets to a village, he rings the bell(按铃) on his bike and everybody小题2: out. They don’t get many visitors 小题3: they’re excited. Today, Rajendra’s first stop is Geeta’s house. She’s got a postcard _小题4:_ her cousin in Bangalore. Rajendra has to read it because Ceeta can’t read. The news is good, so she’s happy.  Rajendra doesn’t 小题5: take the mail. He also takes the pension(退休金) money for the old people. Today Sua gets her pension. She can’t 小题6: her name, so she has to give her fingerprint(指纹) intead. Rajendra has to 小题7: because she’s old. “I don’t know how 小题8: I am,” says Sua. “Maybe 50 or 60?” Her friends think she’s ahout 75. Rajendra also takes a telephone becauae many of the villages don’t have phones. Today, Samundar wants to make a call. She 小题9: Rajendra the phone number and he dials(拨电话号码) for her. She speaks to her son Vishnu. “I told him to come home hecause I need some money,” she says. At the end of the day, Rajendra does the paper work and thinks about his 小题10:. “Sometimes it’s difficult, but it’s a good job,” he says.
|