下列叙述不正确的是A．电子商务以因特网为基础平台 B．电子商务_爱下问搜题

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问题单项选择题

下列叙述不正确的是

A．电子商务以因特网为基础平台

B．电子商务主要以专用网络进行商务活动

C．电子商务以计算机与通信网络为基础平台，利用电子工具实现的在线商业交换和行政作业活动的全过程

D．通过电子商务可以提高服务质量，及时获得顾客的反馈信息

答案

参考答案：A

解析：从广义上讲，电子商务的概念为：以计算机与通信网络为基础平台，利用电子工具实现的在线商业交换和行政作业活动的全过程。主要以专用网络进行商务活动，提高服务质量，及时获得顾客的反馈信息。其主要交易类型有企业与用户的交易方式(B to C)和企业之间的交易(B to B)两种基本形式。

完形填空

George Washington Carver was born in 1864. He was born a slave(奴隶). When he was still a baby, his mother was stolen. He was kept by his master.
All his life George loved 31 . When he was only seven years old, he already knew so 32  about plants that people in his hometown called him “the plant doctor”.
George wanted to learn as much as he could, but there was no   33  for black children where he lived. When he was ten, he left home to find a town that would allow   34  children to attend school. He studied in Missouri and Kansas   35  he finished high school. All this time he had to work to   36  his own expense(费用). He worked as a cook and opened his own laundry.
In 1890, George began college. At first he studied art, but he still had a   37  of plants. He began to study agriculture(农业). After he graduated, the famous inventor Thomas Edison asked him to work in his lab but George   38  . He had other   39 . He started an agricultural organization for black students in Alabama.
In those days, many   40  in the south grew only cotton. This was   41  to the soil(土壤). After a while the   42   would not grow as well. George Washington Carver wanted to help farmers in the south to grow plants like peanuts and sweet potatoes. These plants helped the 43 . Over the years he invented hundreds of ways to use these two plants.
George Washington Carver invented so many things that he was   44  “The Wizard(能手) of Tuskegee”. He died in 1943 at the   45  of 79.

B．suggestions

多项选择题

氧化反应器的尾烧通常发生在（）。

A、反应器入口管线

B、反应器出口管线

C、循环气气-气换热器

D、反应器出口冷却器汽包