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【多选题】
下列关于边际替代率说法正确的有( )。A.
通常商品的边际替代率逐渐递减，其无差异曲线凸向原点
B.
边际替代率可能为无穷大，无差异曲线是一条垂直的直线
C.
边际替代率为常数，无差异曲线是一条向右下方倾斜的直线
D.
边际替代率不可能为零
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反馈参考答案：
举一反三
【判断题】In a email writing, Bcc line can be used for recipients you don’t want other people to know.
A.
正确
B.
错误
【简答题】下列程序中积存在( )中。
【单选题】Which of the following statements is incorrect in writing a professional email?
A.
The more subjects you include in your email the better.
B.
It’s important to state your purpose early and get to the point.
C.
Make sure the body of the email is brief and clear.
D.
Use short sentences, words, and paragraphs.
【判断题】The last step in writing a business email is that you should forward the email to your manager
A.
正确
B.
错误
【判断题】In a email writing, Bcc line can be used for recipients you don’t want other people to know.
A.
正确
B.
错误
【判断题】Subjects like “Hello”, “Enquiry” or “Latest info” are appropriate in email writing.
A.
正确
B.
错误
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