题干

在用天平和量筒测量某种食用油的密度时,以下操作中,不必要且不合理的是(   )

A:用天平测出空烧杯的质量

B:取适量的油倒入烧杯中,用天平测出杯和油的总质量

C:将烧杯中的油倒入量筒中,测出倒入量筒中油的体积

D:用天平测出烧杯和剩余油的总质量

上一题 下一题 0.0难度 选择题 更新时间:2016-02-24 01:50:26

答案(点此获取答案解析)

A

同类题1

阅读理解

    An Interview with Pascal De Sarthe

    French-born Pascal de Sarthe was self-taught and becoming more and more famous among the art businessmen in the 1980s. He became one of the most recognized gallery managers of the 21st century. He made Hong Kong his base in 2010. Today, with one gallery here and another in Beijing, he's clearly fallen in love with art.

    By Philippe Dova

    What made you decide to based in Asia?

    I have been coming to Asia since 1981, doing business first in Japan and Korea, then in the early 90s in Taiwan, China and Southeast Asia. Half of my business was in Asia and I quickly started spending two weeks of every month in his area. I made many friends with new collectors who were interested in both Western and Eastern art. In 2010, staying in Asia and opening a gallery in Hong Kong seemed like the natural thing to do.

    Why Hong Kong?

    There was nothing to indicate that Hong Kong would become the center of the Asian art market. However, there were the wonderful location, the tax(税)advantages and so on---everything just came together.

    Art Basel came to Hong Kong shortly after you did

    There was already Art HK, but after careful research of the market. I believed it was reasonable for Art Basel to take over Art UK.

    What will you be exhibiting at Art Basel this year?

    We'll be showing only postwar Asian artists and new-generation Beijing artists. At the same time, we'll be opening our new gallery in Wong Chuk Hang on the south side of Hong Kong Island.