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思考题:你怎样看莫扎特的话“我每天花八个小时练琴,但是人们却用‘天才’两个字概括我所有的努力”?结合自己的生活经历,谈谈这句话带给你的感受。

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Listen to a short passage concerning American dating and fill in the missing information.[音频][音频][音频]Before marriage, younger Americans date each other, that is, they often go out together. Casual dating usually begins in the early teens, and in the late teens a ___1____ of steady dating develops. There is a great _____2____ that one goes to a dance with one person, to a football game with another, and to a picnic with a third.Sometimes two couples go out together. This is known as “ ___3___ dating”. Group dating is also ____4____ among young people. Large groups of boys and girls may ____5_____ together. Young people may go out together for a long time, which is, ___6_____, a public statement of their ___7_____ to marry. Men and women go out together _____8______ especially those in cities.This is “adult dating”. They ski together, dine together, either at restaurants or in each other’s homes. The American dating ___9____ is a rather casual one. Often young Americans who hardly know each other go out on dates. It is also _____10_____ for them to arrange a “blind date”, that is, a date between two young people who have not met before.

编程计算机的IP地址为192.168.1.12,子网掩码为255.255.255.0,PLC设为以下哪个IP地址能与计算机通信

A. 192.168.1.12
B. 192.168.1.100
C. 192.100.100.100
D. 150.0.0.0

关于PLC通信,以下说法错误的是()

A. PLC的通信方式不止一种
B. 可以利用以太网通信的设备拥有IP地址
C. PLC与计算机通信时不用开机,只需连接网线即可
D. PLC与计算机通信可以完成数据交换

发送和接受同时进行的通信是()

A. 单工通信
B. 半双工通信
C. 全双工通信

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