搜题请搜索小程序“爱下问搜题”
问题 单项选择题

物理层的电气特性有多种标准，其中CCITT 的V.11 建议中规定（6） 。常用的EIA RS-232接口的电气特性与CCITT 的（7） 兼容，在这种电路中，数据“1”的接口电平规定为（8） 。在 RS-232 定义的接口线中， （9） 表示计算机请求发送数据，（10） 表示计算机准备接收数据。

8（）

A．-3～-15V

B．+3～+15V

C．+5～+15V

D． -5～-15V

答案

参考答案：A

翻译题

根据下面短文，将短文中划线部分的句子译成中文

According to American food writer Michael Pollan , the best-tasting , freshest food you can eat is from the garden . 小题1:He just published a new book about healthy eating for kids . The book tells where our food comes from and how kids can eat healthily .

Here are some of his suggestions :

A: Try not to eat anything your grandmother wouldn’t recognize as food .

B: Try to eat packaged(包装) food with more than five ingredients .

C: Try to stay away from foods and drinks that contain a sweetener called high  fructose corn syrup(果葡萄浆) . It makes you fat easily .

D: Try to eat more fresh foods . A food made to last forever is usually full of chemicals .Food should be alive , and that means it should be with Read Labels(标签). 小题2:Pay attention to where your food comes from and how it was grown .
查看答案
单项选择题

( )是个性结构中的最高层次，决定着一个人总的个性倾向和态度。

A．世界观

B．个性倾向性

C．性格

D．理想
查看答案