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【多选题】
无差异曲线的特点有（ ）。A.
无差异曲线的条数是无限的，密布整个平面
B.
无差异曲线是一族互不相交的、向上倾斜的曲线
C.
无差异曲线的位置越高，它带来的满意程度就越高
D.
落在同一条无差异曲线上的组合有相同的满意程度
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反馈参考答案：
举一反三
【单选题】Conversation 1 15.A. Making a sales plan C. Doing a market survey B. Preparing an annual report D. Writing a business letter
A.
Making a sales plan
B.
Preparing an annual report
C.
Doing a market survey
D.
Writing a business letter
【单选题】A survey was carried out on the sleep time of students in middle schools, ______ were surprising.
A.
its results
B.
whose result
C.
the results of which
D.
of which results
【单选题】A survey was carried out on the death rate of new born babies in that region, ______ were surprising.
A.
as results
B.
which results
C.
the results of it
D.
the results of which
【单选题】A survey was carried out on the death rate of new-born babies in that region, the results of which were surprising.
A.
一项关于新生儿死亡率的调查在那个地区被展开，结果令人惊讶。
B.
一项关于那个地区新生儿死亡率的调查被执行，结果令人惊讶。
C.
那个地区的新生儿死亡率的调查表令人惊讶。
D.
在那个地区进行了一次新生儿死亡率调查，结果令人惊讶。
【单选题】对于被水汽饱和的湿空气,下列说法正确的是( )
A.
该湿空气的湿球温度介于干球温度和露点温度之间
B.
该湿空气的湿度与温度无关
C.
该湿空气的绝对湿度百分数等于其相对湿度
D.
该湿空气在改变温度时，其湿容积不变
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