EIA协会制定的标准中RS-232定义的传输距离是（） A.15米 B.20米 C._爱下问搜题

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问题单项选择题

EIA协会制定的标准中RS-232定义的传输距离是（）

A.15米

B.20米

C.25米

D.400米

答案

参考答案：A

选择题

关于美国商品谷物农业生产的叙述，正确的是： [ ]

A．密西西比河下游平原发展商品谷物生产的区位条件最优越

B．美国是世界上最大的商品谷物生产国

C．美国人口众多，为商品谷物生产提供了大量劳动力

D．美国商品谷物生产一般是国营的

多项选择题

Part 1: Self-introduction

·The interlocutor will ask you and your partner questions about yourselves. You may be asked about things like "your hometown", "your interests ", "your career plans", etc.

Part 2: Presentation

·The interlocutor gives you two photographs and asks you to talk about them for about one minute. The examiner then asks your partner a question about your photographs and your partner responds briefly. Then the interlocutor gives your partner two photographs. Your partner talks about these pictures for about one minute. This time the interlocutor asks you a question about your partner, s photographs and you respond briefly.

Part 3: Collaboration

·The interlocutor gives you andyour partner a list of topics. Both of you need to choose one to discuss together: The interlocutor may join in the conversation and ask you questions, but you and your partner are expected to develop the conversation.

Topic 1:

Topic 2:

Children’s Family Education

Topic 3:

Factors That You Should Consider When You Plan to Buy a House

Topic 4:

Topic 5:

Threats in the 21st Century