题目内容

Tobecomeapilot,youmust__________atleast1,000hoursof flyingtime.

A. clock
B. clock in
C. clock up

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1、消息中有意义的内容称为。（）。

A. 消息
B. 信息
C. 信号
D. 电信量

电信是利用、、或其他电磁系统进行的，对于符号、信号、文字、图像、声音或任何性质信息的传输、发送或接收。

信号包含、和电信号等形式。

The following opinions are typical ethnocentric attitudes:l Most other cultures are _____ compared with my culture.l My culture should be the _ for other cultures.l Other people are much the _ as my people.l Our way of doing things is the only _____ way.