A complimentary close is used for ____________.
A. saying goodbye
B. sending your love
C. asking people to write back
D. none of the above
查看答案
When you write an email, keep these in mind:
A. keep your message short, clear and to the point
B. follow expectations for style, tone, and formatting
C. keep your message long and complex
D. don't follow expectations for style, tone, and formatting
出版社的规模越大，出书越多，其出版社代码就越短。
A. 对
B. 错
中国大陆的国际标准书号国家代码是7
A. 对
B. 错
周期函数在一个周期上的定积分与起点有关。
A. 对
B. 错
微信支付 
支付宝支付