皮皮学，免费搜题
登录
搜题
【单选题】
Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network?A.
RIP
B.
STP
C.
IGRP
D.
CDP
E.
VTP
F.
None of the above
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】S7-200 PLC 常用的编程语言有( )、( )、( )及( )。
【简答题】品种纯度检验可分为田问纯度检验、室内纯度检验和田间小区种植鉴定，每类方法有其特点和适用范围.近几年，室内纯度检验快速测定方法发展较快，取得了一定的进展.试论述这三类方法各自的作用及其优缺点，并对室内纯度检验快速测定方法的应用前景作出评价。
【单选题】下列对于司机的介绍表述恰当的是:
A.
The bus driver is Mr. Wang. He has driven for 10 years. He is a good driver and he is sure to make your travel safe and sound.
B.
Our driver is Mr. Wang. He is very experienced. There is no worry about him. Everything is under control.
C.
Our driver is Mr. Wang. He has more than 10 years of driving experience, so he will make sure we have a safe and pleasant trip in Shanxi.
【简答题】本门课程的QQ群号码是
【简答题】S7-200系列PLC常用的编程语言有什么?
【简答题】S7-200PLC常用的编程语言有____ 、_____和功能块语言。
相关题目：